feat(gitlab): add CI/CD component

This adds a GitLab CI/CD component that can be `included` in users
GitLab CI configuration to integrate releaser-pleaser.

Unlike the GitHub Action, this can not easily run whenever a merge
request description is changed, only when changes are pushed to main.

.github/workflows/mirror.yaml

@@ -0,0 +1,28 @@
+name: mirror
+on:
+  push:
+    branches: [main]
+    tags: ["*"]
+
+jobs:
+  gitlab-com:
+    runs-on: ubuntu-latest
+    env:
+      REMOTE: mirror
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          # Need all to fetch all tags so we can push them
+          fetch-depth: 0
+
+      - name: Add Remote
+        env:
+          CLONE_URL: "https://releaser-pleaser:${{ secrets.GITLAB_COM_PUSH_TOKEN }}@gitlab.com/apricote/releaser-pleaser.git"
+        run: git remote add $REMOTE $CLONE_URL
+
+      - name: Push Branches
+        run: git push --force --all --verbose $REMOTE
+
+      - name: Push Tags
+        run: git push --force --tags --verbose $REMOTE

.gitlab-ci.yml

@@ -0,0 +1,15 @@
+stages: [release]
+
+# For the GitLab CI/CD component to be usable, it needs to be published in
+# the CI/CD catalog. This happens on new releases.
+# As the primary tagging happens on GitHub, we only react to pushed tags
+# and create a corresponding GitLab Release.
+create-release:
+  stage: release
+  image: registry.gitlab.com/gitlab-org/release-cli:latest
+  script: echo "Creating release $CI_COMMIT_TAG"
+  rules:
+    - if: $CI_COMMIT_TAG
+  release:
+    tag_name: "$CI_COMMIT_TAG"
+    description: "$CI_COMMIT_TAG_MESSAGE"

.ko.yaml

@@ -1,3 +1,6 @@
 defaultPlatforms:
   - linux/arm64
-  - linux/amd64
+  - linux/amd64
+
+# Need a shell for gitlab-ci
+defaultBaseImage: cgr.dev/chainguard/busybox

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [v0.4.0-beta.0](https://github.com/apricote/releaser-pleaser/releases/tag/v0.4.0-beta.0)
+
+### Features
+
+- add support for GitLab repositories (#49)
+
+### Bug Fixes
+
+- **parser**: continue on unparsable commit message (#48)
+- **cli**: command name in help output (#52)
+- **parser**: invalid handling of empty lines (#53)
+
 ## [v0.3.0](https://github.com/apricote/releaser-pleaser/releases/tag/v0.3.0)
 
 ### :sparkles: Highlights

action.yml

@@ -21,7 +21,7 @@ inputs:
 outputs: {}
 runs:
   using: 'docker'
-  image: ghcr.io/apricote/releaser-pleaser:v0.3.0 # x-releaser-pleaser-version
+  image: ghcr.io/apricote/releaser-pleaser:v0.4.0-beta.0 # x-releaser-pleaser-version
   args:
     - run
     - --forge=github

templates/run.yml

@@ -0,0 +1,36 @@
+spec:
+  inputs:
+    # Remember to update docs/reference/gitlab-ci-component.md
+    branch:
+      default: main
+      description: "This branch is used as the target for releases."
+
+    token:
+      description: "GitLab token for creating and updating release MRs."
+
+    extra-files:
+      description: 'List of files that are scanned for version references.'
+      default: ""
+
+    stage:
+      default: build
+      description: 'Defines the build stage'
+    # Remember to update docs/reference/gitlab-ci-component.md
+---
+
+releaser-pleaser:
+  stage: $[[ inputs.stage ]]
+  rules:
+    # There is no way to run a pipeline when the MR description is updated :(
+    - if: $CI_COMMIT_BRANCH == "$[[ inputs.branch ]]"
+  image:
+    name: ghcr.io/apricote/releaser-pleaser:v0.4.0-beta.0 # x-releaser-pleaser-version
+    entrypoint: [""]
+  variables:
+    GITLAB_TOKEN: $[[ inputs.token ]]
+  script:
+    - |
+      rp run \
+        --forge=gitlab \
+        --branch=$[[ inputs.branch ]] \
+        --extra-files=$[[ inputs.extra-files ]]