Update Pages 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-1.yml

+---
+title: Update Pages template examples to default branch
+merge_request: 56298
+author:
+type: other

lib/gitlab/ci/templates/Pages/Brunch.gitlab-ci.yml

@@ -11,5 +11,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Doxygen.gitlab-ci.yml

@@ -9,5 +9,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Gatsby.gitlab-ci.yml

@@ -13,5 +13,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/HTML.gitlab-ci.yml

@@ -8,5 +8,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Harp.gitlab-ci.yml

@@ -11,5 +11,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Hexo.gitlab-ci.yml

@@ -13,5 +13,5 @@ pages:
     paths:
       - node_modules
     key: project
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Hugo.gitlab-ci.yml

@@ -10,7 +10,8 @@ test:
   script:
     - hugo
   except:
-    - master
+    variables:
+      - $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
 pages:
   script:
@@ -19,4 +20,5 @@ pages:
     paths:
       - public
   only:
-    - master
+    variables:
+      - $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Hyde.gitlab-ci.yml

@@ -11,7 +11,8 @@ test:
     - pip install hyde
     - hyde gen
   except:
-    - master
+    variables:
+      - $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
 pages:
   stage: deploy
@@ -22,4 +23,5 @@ pages:
     paths:
       - public
   only:
-    - master
+    variables:
+      - $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Jekyll.gitlab-ci.yml

@@ -18,7 +18,8 @@ test:
     paths:
       - test
   except:
-    - master
+    variables:
+      - $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
 pages:
   stage: deploy
@@ -28,4 +29,5 @@ pages:
     paths:
       - public
   only:
-    - master
+    variables:
+      - $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Jigsaw.gitlab-ci.yml

@@ -33,5 +33,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Lektor.gitlab-ci.yml

@@ -8,5 +8,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Metalsmith.gitlab-ci.yml

@@ -12,5 +12,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Middleman.gitlab-ci.yml

@@ -12,7 +12,8 @@ test:
     - bundle install --path vendor
     - bundle exec middleman build
   except:
-    - master
+    variables:
+      - $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
 pages:
   script:
@@ -23,5 +24,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Nanoc.gitlab-ci.yml

@@ -8,5 +8,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/Octopress.gitlab-ci.yml

@@ -11,5 +11,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

lib/gitlab/ci/templates/Pages/SwaggerUI.gitlab-ci.yml

@@ -25,5 +25,5 @@ pages:
   artifacts:
     paths:
       - public
-  only:
-    - master
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH