Support skipping tests in CI for self-managed

This change set allows to disable the unit and integration tests in the
pipeline intended for GitLab self-managed to save runner resources.

Changelog: added

Closes https://gitlab.com/components/opentofu/-/issues/40

.gitlab-ci.yml

@@ -8,6 +8,8 @@ workflow:
 include:
   - local: tests/unit.gitlab-ci.yml
     rules:
+      - if: $SKIP_TESTS == "true"
+        when: never
       - changes:
           - src/gitlab-tofu.sh
           - Dockerfile
@@ -16,6 +18,8 @@ include:
       - if: $CI_COMMIT_TAG
   - local: tests/integration.gitlab-ci.yml
     rules:
+      - if: $SKIP_TESTS == "true"
+        when: never
       - changes:
           - src/gitlab-tofu.sh
           - Dockerfile

.gitlab/README.md.template

@@ -274,6 +274,9 @@ need to change that path in the `include:component` and additionally provide the
 See also the official GitLab documentation for it
 [here](https://docs.gitlab.com/ee/ci/components/#use-a-gitlabcom-component-in-a-self-managed-instance).
 
+If you want to save runner resources you may disable the unit and integration tests
+by setting the `SKIP_TESTS` CI/CD variable to `true`.
+
 ## Migrating from the Terraform CI/CD templates
 
 When migrating from the GitLab Terraform CI/CD templates you can use the following migration rules:

README.md

@@ -299,6 +299,9 @@ need to change that path in the `include:component` and additionally provide the
 See also the official GitLab documentation for it
 [here](https://docs.gitlab.com/ee/ci/components/#use-a-gitlabcom-component-in-a-self-managed-instance).
 
+If you want to save runner resources you may disable the unit and integration tests
+by setting the `SKIP_TESTS` CI/CD variable to `true`.
+
 ## Migrating from the Terraform CI/CD templates
 
 When migrating from the GitLab Terraform CI/CD templates you can use the following migration rules: