ci: add dockerignore

.dockerignore

+*
+!src

.gitlab-ci.yml

@@ -15,6 +15,7 @@ include:
           - src/gitlab-tofu.sh
           - opentofu_versions.yaml
           - Dockerfile
+          - .dockerignore
           - .gitlab-ci.yml
           - tests/unit.gitlab-ci.yml
           - tests/unit/*
@@ -27,6 +28,7 @@ include:
           - src/gitlab-tofu.sh
           - opentofu_versions.yaml
           - Dockerfile
+          - .dockerignore
           - .gitlab-ci.yml
           - templates/*.yml
           - tests/integration.gitlab-ci.yml
@@ -115,6 +117,7 @@ gitlab-opentofu-image:build:
     - if: $CI_COMMIT_TAG
     - changes:
         - Dockerfile
+        - .dockerignore
         - opentofu_versions.yaml
         - .gitlab-ci.yml
         - src/**/*