Add reusable Forgejo Actions

Composite actions for CI/CD workflows:
- checkout: Clone repo with configurable depth
- docker-build: Build Docker images with multiple tags
- docker-push: Push to Forgejo Packages registry
- create-tag: Auto-increment semantic version tags
- create-issue: Create issues via Forgejo API
- create-pr: Create pull requests via Forgejo API
- comment-pr: Add comments to PRs via Forgejo API

All actions use shell scripts (no Node.js required).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

create-tag/action.yaml

@@ -0,0 +1,49 @@
+name: Create Tag
+description: Auto-increment and create a version tag
+
+inputs:
+  prefix:
+    description: Tag prefix (e.g., 'v', 'myapp-v')
+    default: 'v'
+  token:
+    description: Token for pushing tags
+    default: ${{ github.token }}
+
+outputs:
+  tag:
+    description: The created tag name
+    value: ${{ steps.version.outputs.tag }}
+  version:
+    description: The version number without prefix
+    value: ${{ steps.version.outputs.version }}
+
+runs:
+  using: composite
+  steps:
+    - id: version
+      shell: bash
+      run: |
+        PREFIX="${{ inputs.prefix }}"
+
+        # Find latest tag with this prefix
+        LATEST_TAG=$(git tag -l "${PREFIX}*" | sort -V | tail -1)
+
+        if [ -z "$LATEST_TAG" ]; then
+          NEXT_VERSION="${PREFIX}1.0.0"
+        else
+          # Extract version and increment patch
+          CURRENT_VERSION=${LATEST_TAG#$PREFIX}
+          IFS='.' read -r MAJOR MINOR PATCH <<< "$CURRENT_VERSION"
+          NEXT_VERSION="${PREFIX}${MAJOR}.${MINOR}.$((PATCH + 1))"
+        fi
+
+        echo "tag=$NEXT_VERSION" >> $GITHUB_OUTPUT
+        echo "version=${NEXT_VERSION#$PREFIX}" >> $GITHUB_OUTPUT
+
+        # Configure git and create tag
+        git config user.name forgejo-actions
+        git config user.email forgejo-actions@code.flowmade.one
+        git tag "$NEXT_VERSION"
+
+        # Push tag using token
+        git push "https://oauth2:${{ inputs.token }}@code.flowmade.one/${{ github.repository }}.git" "$NEXT_VERSION"