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>

docker-push/action.yaml

@@ -0,0 +1,41 @@
+name: Docker Push
+description: Push Docker image to Forgejo Packages registry
+
+inputs:
+  image:
+    description: Full image name (registry/org/name)
+    required: true
+  tags:
+    description: Comma-separated list of tags to push
+    default: 'latest'
+  registry:
+    description: Registry URL
+    default: 'code.flowmade.one'
+  username:
+    description: Registry username
+    default: ${{ github.repository_owner }}
+  password:
+    description: Registry password/token
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: |
+        IMAGE="${{ inputs.image }}"
+        TAGS="${{ inputs.tags }}"
+        REGISTRY="${{ inputs.registry }}"
+        USERNAME="${{ inputs.username }}"
+        PASSWORD="${{ inputs.password }}"
+
+        # Login to registry
+        echo "$PASSWORD" | docker login "$REGISTRY" -u "$USERNAME" --password-stdin
+
+        # Push each tag
+        IFS=',' read -ra TAG_ARRAY <<< "$TAGS"
+        for tag in "${TAG_ARRAY[@]}"; do
+          tag=$(echo "$tag" | xargs)  # trim whitespace
+          echo "Pushing $IMAGE:$tag"
+          docker push "$IMAGE:$tag"
+        done