feat: tag automatically when version changes

.gitlab-ci.yml

@@ -36,13 +36,32 @@ pages:
     paths:
     - public
 
-# This will push the gem to ruby-gems when tagged
+# This will tag the repository when the version-file changes and the theme successfully builds
+tag:
+  stage: deploy
+  variables:
+    VERSION_FILE: "lib/jekyll-theme-lcsb-default.rb"
+  script:
+    # Make sure that the version exists
+    - VERSION=$(cat $VERSION_FILE | grep -o "\d\.\d\.\d")
+    - '[[ -z $VERSION ]] && exit -1 || echo "OK, version appears to be correct -> $VERSION"'
+
+    # Create the tag
+    - git tag -a $VERSION
+
+    # Publish the tag
+    - git push origin $VERSION
+  only:
+    changes:
+      - "lib/jekyll-theme-lcsb-default.rb"
+
+# This will push the gem to ruby-gems when the repository has been tagged
 release:
   stage: release
   script:
     - mkdir -p ~/.gem && echo "$API_KEY_BASE64" | base64 --decode > ~/.gem/credentials && chmod 0600 ~/.gem/credentials
     - gem build jekyll-theme-lcsb-default.gemspec && gem push jekyll-theme-lcsb-default*.gem
   rules:
-    # Run only on master...
+    # Run only when there is a new tag
     - if: $CI_COMMIT_TAG
 

jekyll-theme-lcsb-default.gemspec

 # frozen_string_literal: true
 
+# Load version
+require File.expand_path("lib/jekyll-theme-lcsb-default", __dir__)
+
 Gem::Specification.new do |spec|
   spec.name          = "jekyll-theme-lcsb-default"
-  spec.version       = "0.3.16"
+  spec.version       = Theme::VERSION
   spec.authors       = ["Trefex", "jaceklebioda_lux"]
   spec.email         = ["lcsb-sysadmins@uni.lu"]
 
@@ -10,7 +13,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = "https://git-r3lab.uni.lu/core-services/jekyll-theme-lcsb-default"
   spec.license       = "MIT"
 
-  spec.files         = `git ls-files -z`.split("\x0").select { |f| f.match(%r!^(assets|_layouts|_includes|_sass|LICENSE|README)!i) }
+  spec.files         = `git ls-files -z`.split("\x0").select { |f| f.match(%r!^(assets|_layouts|lib|_includes|_sass|LICENSE|README)!i) }
 
   spec.add_runtime_dependency "jekyll", "~> 4.0"
   spec.add_runtime_dependency "jekyll-seo-tag", "~> 2.5"

lib/jekyll-theme-lcsb-default.rb

+# frozen_string_literal: true
+
+# Note: remember to keep it in the format of NUMBER.NUMBER.NUMBER (where NUMBER is [0-9]+) - otherwise gitlab-ci could fail to detect the version
+module Theme
+    VERSION = "0.3.17"
+end
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