add docker/metadata-action

.gitea/workflows/ci.yaml

@@ -1,7 +1,16 @@
 ---
 name: Gitea Actions Demo
 run-name: ${{ gitea.actor }} is testing out Gitea Actions 🚀
-on: [push]
+
+on:
+  schedule: 
+    - cron: "0 10 * * *"
+  push:
+    branches:
+      - "**"
+    tags:
+      - "v*.*.*"
+  pull_request:
 
 jobs:
   lint:
@@ -40,9 +49,8 @@ jobs:
 
       - run: bundle exec rake
 
-  release-image:
+  docker:
     needs: test
-    if: github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
     container:
       image: catthehacker/ubuntu:act-latest
@@ -55,6 +63,21 @@ jobs:
         with:
           fetch-depth: 0 # all history for all branches and tags
 
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            git.kill0.net/ryanc/kubernaut
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -68,5 +91,6 @@ jobs:
       - name: Docker build and push
         uses: docker/build-push-action@v5
         with:
-          push: true
+          push: ${{ github.event_name != 'pull_request' }}
-          tags: git.kill0.net/ryanc/kubernaut:latest
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}