Update CI template examples to default branch

We don't need to hardcode to master, we should use the
default branch CI/CD variable

changelogs/unreleased/update-ci-template-default-branch-2.yml

+---
+title: Update CI template examples to default branch
+merge_request: 56301
+author:
+type: other

lib/gitlab/ci/templates/Julia.gitlab-ci.yml

@@ -10,11 +10,11 @@
 
 # Below is the template to run your tests in Julia
 .test_template: &test_definition
-  # Uncomment below if you would like to run the tests on specific references
-  # only, such as the branches `master`, `development`, etc.
-  # only:
-  #   - master
-  #   - development
+  # Uncomment below (and adjust as needed) to run the tests for specific references
+  # only, such as the default branch, a `development` branch, and so on:
+  # rules:
+  #   - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+  #   - if: $CI_COMMIT_BRANCH == "development"
   script:
     # Let's run the tests. Substitute `coverage = false` below, if you do not
     # want coverage results.
@@ -63,8 +63,8 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
 
 # WARNING: This template is using the `julia` images from [Docker
 # Hub][3]. One can use custom Julia images and/or the official ones found

lib/gitlab/ci/templates/Maven.gitlab-ci.yml

@@ -33,7 +33,8 @@ cache:
   script:
     - 'mvn $MAVEN_CLI_OPTS verify'
   except:
-    - master
+    variables:
+      - $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
 
 # Verify merge requests using JDK8
 verify:jdk8:
@@ -51,4 +52,5 @@ deploy:jdk8:
       fi
     - 'mvn $MAVEN_CLI_OPTS deploy -s ci_settings.xml'
   only:
-    - master
+    variables:
+      - $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Mono.gitlab-ci.yml

@@ -24,8 +24,8 @@ before_script:
 
 release:
   stage: deploy
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
   artifacts:
     paths:
       - build/release/MyProject.exe

lib/gitlab/ci/templates/Packer.gitlab-ci.yml

@@ -23,6 +23,6 @@ build:
   environment: production
   script:
     - find . -maxdepth 1 -name '*.json' -print0 | xargs -t0n1 packer build
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
       when: manual
-  only:
-    - master

lib/gitlab/ci/templates/Python.gitlab-ci.yml

@@ -47,5 +47,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Swift.gitlab-ci.yml

@@ -21,8 +21,8 @@ archive_project:
   script:
     - xcodebuild clean archive -archivePath build/ProjectName -scheme SchemeName
     - xcodebuild -exportArchive -exportFormat ipa -archivePath "build/ProjectName.xcarchive" -exportPath "build/ProjectName.ipa" -exportProvisioningProfile "ProvisioningProfileName"
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
   artifacts:
     paths:
       - build/ProjectName.ipa