"trigger" keyword and failing strategy

Summary

Use the trigger keyword as defined here and also set strategy: depend.

This MR implements caosdb/internal/all#650 and caosdb/internal/all#526.

Focus

Is the old functionality reproduced?

Test Environment

Watch the pipelines.

Check List for the Author

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• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

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.gitlab-ci.yml

@@ -99,17 +99,23 @@ unittests-mysql-5:
 
 # Trigger building of server image and integration tests
 trigger_build:
-  tags: [ docker ]
   stage: deploy
-  script:
-    - /usr/bin/curl -X POST
-      -F token=$CI_JOB_TOKEN
-      -F "variables[F_BRANCH]=$CI_COMMIT_REF_NAME"
-      -F "variables[MYSQLBACKEND]=$CI_COMMIT_REF_NAME"
-      -F "variables[TriggerdBy]=MYSQLBACKEND"
-      -F "variables[TriggerdByHash]=$CI_COMMIT_SHORT_SHA"
-      -F ref=$DEPLOY_REF https://gitlab.indiscale.com/api/v4/projects/14/trigger/pipeline
-
+  inherit:
+    variables:
+      # List the variables that shall be inherited, which also means they will override any equally
+      # named varibles in child pipelines.
+      - DEPLOY_REF
+  variables:
+    F_BRANCH: $CI_COMMIT_REF_NAME
+    MYSQLBACKEND: $CI_COMMIT_REF_NAME
+    TRIGGERED_BY_REPO: MYSQLBACKEND
+    TRIGGERED_BY_REF: $CI_COMMIT_REF_NAME
+    TRIGGERED_BY_HASH: $CI_COMMIT_SHORT_SHA
+
+  trigger:
+    project: caosdb/src/caosdb-deploy
+    branch: $DEPLOY_REF
+    strategy: depend
 
 # Build the sphinx documentation and make it ready for deployment by Gitlab Pages
 # Special job for serving a static website. See https://docs.gitlab.com/ee/ci/yaml/README.html#pages