Merge branch 'ci-improvement' into 'master'

Prevent duplicate pipelines for merge requests

See merge request OpenMW/openmw!2387

.gitlab-ci.yml

@@ -1,5 +1,14 @@
 default:
   interruptible: true
+  
+# Merge requests have two pipelines, filter pipelines using branch and merge request event together.
+# See https://docs.gitlab.com/ee/ci/pipelines/merge_request_pipelines.html#two-pipelines-when-pushing-to-a-branch
+workflow:
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+    - if: $CI_COMMIT_BRANCH && $CI_OPEN_MERGE_REQUESTS
+      when: never
+    - if: $CI_COMMIT_BRANCH
 
 # Note: We set `needs` on each job to control the job DAG.
 # See https://docs.gitlab.com/ee/ci/yaml/#needs
@@ -20,8 +29,6 @@ variables:
     - docker
     - linux
   image: ubuntu:22.04
-  rules:
-    - if: $CI_PIPELINE_SOURCE == "push"
 
 .Ubuntu:
   extends: .Ubuntu_Image
@@ -388,8 +395,6 @@ macOS12_Xcode13:
 .Windows_Ninja_Base:
   tags:
     - windows
-  rules:
-    - if: $CI_PIPELINE_SOURCE == "push"
   before_script:
   - Import-Module "$env:ChocolateyInstall\helpers\chocolateyProfile.psm1"
   - choco source add -n=openmw-proxy -s="https://repo.openmw.org/repository/Chocolatey/" --priority=1
@@ -491,8 +496,6 @@ macOS12_Xcode13:
 .Windows_MSBuild_Base:
   tags:
     - windows
-  rules:
-    - if: $CI_PIPELINE_SOURCE == "push"
   before_script:
   - Import-Module "$env:ChocolateyInstall\helpers\chocolateyProfile.psm1"
   - choco source add -n=openmw-proxy -s="https://repo.openmw.org/repository/Chocolatey/" --priority=1
@@ -590,9 +593,9 @@ Windows_MSBuild_RelWithDebInfo:
   rules:
     # run this for both pushes and schedules so 'latest successful pipeline for branch' always includes it
     - if: $CI_PIPELINE_SOURCE == "push"
+    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
     - if: $CI_PIPELINE_SOURCE == "schedule"
 
-
 .Ubuntu_AndroidNDK_arm64-v8a:
   tags:
     - linux