Remove image_digest input regex for now

We cannot use it because of
https://gitlab.com/gitlab-org/gitlab/-/issues/477707

templates/apply.yml

@@ -60,7 +60,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/custom-command.yml

@@ -60,7 +60,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/destroy.yml

@@ -60,7 +60,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/fmt.yml

@@ -60,7 +60,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/full-pipeline.yml

@@ -69,7 +69,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/graph.yml

@@ -60,7 +60,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/job-templates.yml

@@ -69,7 +69,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/plan.yml

@@ -60,7 +60,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/test.yml

@@ -60,7 +60,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/validate-plan-apply.yml

@@ -63,7 +63,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/validate-plan-destroy.yml

@@ -63,7 +63,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/validate-plan.yml

@@ -60,7 +60,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration

templates/validate.yml

@@ -60,7 +60,10 @@ spec:
 
     image_digest:
       default: ''
-      regex: '^(@sha256:[a-z0-9]{64})?$'
+      # FIXME: we cannot use regex yet because of a bug that rejects
+      # empty strings from ever being checked against the regex.
+      # see https://gitlab.com/gitlab-org/gitlab/-/issues/477707
+      # regex: '^(@sha256:[a-z0-9]{64})?$'
       description: 'Image digest of the image you want to use. The format must be `@<image_digest>`, e.g. `@sha256:abc..`, see regex of this input. Please consult the release page at https://gitlab.com/components/opentofu/-/releases to obtain the image digests.'
 
     # Configuration