feat(workflow): Changes our common workflow to git-flow-with-merge-request

According to discussion in ci-cd#237 / weekly

documentation/chapters/templates/common/common-ci-workflow.adoc

@@ -1,12 +0,0 @@
-:gitlab-ci-file: common/common-ci-workflow.gitlab-ci.yml
-
-[[Common-Workflow]]
-== Common Workflow
-
-Within the `{gitlab-ci-file}` file we provide a common workflow.
-This workflow runs all pipelines (including branch pipelines, tag pipelines, merge request pipelines, triggerd pipelines, shedules-pipelines ...).
-However, it prevents that a branch pipeline starts, when there is an open merge request.
-To use our common workflow, just import the template.
-
-:template: {gitlab-ci-file}
-include::../../../template-printer.adoc[]

documentation/chapters/templates/common/workflow-gitflow.adoc

@@ -0,0 +1,11 @@
+:gitlab-ci-file: common/workflow-gitflow.gitlab-ci.yml
+
+[[Common-Workflow]]
+== Common Workflow
+
+Within the `{gitlab-ci-file}` file we provide our common workflow, the https://docs.gitlab.com/ee/ci/yaml/workflow.html#git-flow-with-merge-request-pipelines[Git Flow with merge request workflow].
+This workflow runs pipelines for merge requests, tags, and protected branches.
+To use our common workflow, just import the template.
+
+:template: {gitlab-ci-file}
+include::../../../template-printer.adoc[]

documentation/document.adoc

@@ -35,7 +35,7 @@ toc::[]
 
 include::generalInformation.adoc[leveloffset=1]
 include::chapters/templates/common/common-ci-variablen.adoc[leveloffset=1]
-include::chapters/templates/common/common-ci-workflow.adoc[leveloffset=1]
+include::chapters/templates/common/workflow-gitflow.adoc[leveloffset=1]
 
 == Contribution
 

templates/common/common-ci-workflow.gitlab-ci.yml

@@ -1,6 +0,0 @@
-workflow:
-  rules:
-    # Prevent branch pipelines when there is an open merge request
-    - if: $CI_COMMIT_BRANCH && $CI_OPEN_MERGE_REQUESTS && $CI_PIPELINE_SOURCE == "push"
-      when: never
-    - when: always

templates/common/workflow-gitflow.gitlab-ci.yml

@@ -0,0 +1,5 @@
+workflow:
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+    - if: $CI_COMMIT_TAG
+    - if: $CI_COMMIT_REF_PROTECTED