ci: Use docker-tags composite action for multi-channel release support

Adds next-release branch trigger and replaces separate dev/production
build steps with the shared docker-tags action for tag resolution.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -3,6 +3,7 @@
 # CI/CD pipeline for Paper Dynasty Database API:
 # - Builds Docker images on every push/PR
 # - Auto-generates CalVer version (YYYY.MM.BUILD) on main branch merges
+# - Supports multi-channel releases: stable (main), rc (next-release), dev (PRs)
 # - Pushes to Docker Hub and creates git tag on main
 # - Sends Discord notifications on success/failure
 
@@ -12,6 +13,7 @@ on:
   push:
     branches:
       - main
+      - next-release
   pull_request:
     branches:
       - main
@@ -39,30 +41,20 @@ jobs:
         id: calver
         uses: cal/gitea-actions/calver@main
 
-      # Dev build: push with dev + dev-SHA tags (PR/feature branches)
-      - name: Build Docker image (dev)
-        if: github.ref != 'refs/heads/main'
-        uses: https://github.com/docker/build-push-action@v5
+      - name: Resolve Docker tags
+        id: tags
+        uses: cal/gitea-actions/docker-tags@main
         with:
-          context: .
-          push: true
-          tags: |
-            manticorum67/paper-dynasty-database:dev
-            manticorum67/paper-dynasty-database:dev-${{ steps.calver.outputs.sha_short }}
-          cache-from: type=registry,ref=manticorum67/paper-dynasty-database:buildcache
-          cache-to: type=registry,ref=manticorum67/paper-dynasty-database:buildcache,mode=max
+          image: manticorum67/paper-dynasty-database
+          version: ${{ steps.calver.outputs.version }}
+          sha_short: ${{ steps.calver.outputs.sha_short }}
 
-      # Production build: push with latest + CalVer tags (main only)
-      - name: Build Docker image (production)
-        if: github.ref == 'refs/heads/main'
+      - name: Build and push Docker image
         uses: https://github.com/docker/build-push-action@v5
         with:
           context: .
           push: true
-          tags: |
-            manticorum67/paper-dynasty-database:latest
-            manticorum67/paper-dynasty-database:${{ steps.calver.outputs.version }}
-            manticorum67/paper-dynasty-database:${{ steps.calver.outputs.version_sha }}
+          tags: ${{ steps.tags.outputs.tags }}
           cache-from: type=registry,ref=manticorum67/paper-dynasty-database:buildcache
           cache-to: type=registry,ref=manticorum67/paper-dynasty-database:buildcache,mode=max
 
@@ -77,38 +69,35 @@ jobs:
         run: |
           echo "## Docker Build Successful" >> $GITHUB_STEP_SUMMARY
           echo "" >> $GITHUB_STEP_SUMMARY
+          echo "**Channel:** \`${{ steps.tags.outputs.channel }}\`" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
           echo "**Image Tags:**" >> $GITHUB_STEP_SUMMARY
-          echo "- \`manticorum67/paper-dynasty-database:latest\`" >> $GITHUB_STEP_SUMMARY
-          echo "- \`manticorum67/paper-dynasty-database:${{ steps.calver.outputs.version }}\`" >> $GITHUB_STEP_SUMMARY
-          echo "- \`manticorum67/paper-dynasty-database:${{ steps.calver.outputs.version_sha }}\`" >> $GITHUB_STEP_SUMMARY
+          IFS=',' read -ra TAG_ARRAY <<< "${{ steps.tags.outputs.tags }}"
+          for tag in "${TAG_ARRAY[@]}"; do
+            echo "- \`${tag}\`" >> $GITHUB_STEP_SUMMARY
+          done
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "**Build Details:**" >> $GITHUB_STEP_SUMMARY
           echo "- Branch: \`${{ steps.calver.outputs.branch }}\`" >> $GITHUB_STEP_SUMMARY
           echo "- Commit: \`${{ github.sha }}\`" >> $GITHUB_STEP_SUMMARY
           echo "- Timestamp: \`${{ steps.calver.outputs.timestamp }}\`" >> $GITHUB_STEP_SUMMARY
           echo "" >> $GITHUB_STEP_SUMMARY
-          if [ "${{ github.ref }}" == "refs/heads/main" ]; then
-            echo "Pushed to Docker Hub!" >> $GITHUB_STEP_SUMMARY
-            echo "" >> $GITHUB_STEP_SUMMARY
-            echo "Pull with: \`docker pull manticorum67/paper-dynasty-database:latest\`" >> $GITHUB_STEP_SUMMARY
-          else
-            echo "_PR build - image not pushed to Docker Hub_" >> $GITHUB_STEP_SUMMARY
-          fi
+          echo "Pull with: \`docker pull manticorum67/paper-dynasty-database:${{ steps.tags.outputs.primary_tag }}\`" >> $GITHUB_STEP_SUMMARY
 
       - name: Discord Notification - Success
-        if: success() && github.ref == 'refs/heads/main'
+        if: success() && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/next-release')
         uses: cal/gitea-actions/discord-notify@main
         with:
           webhook_url: ${{ secrets.DISCORD_WEBHOOK }}
           title: "Paper Dynasty Database"
           status: success
           version: ${{ steps.calver.outputs.version }}
-          image_tag: ${{ steps.calver.outputs.version_sha }}
+          image_tag: ${{ steps.tags.outputs.primary_tag }}
           commit_sha: ${{ steps.calver.outputs.sha_short }}
           timestamp: ${{ steps.calver.outputs.timestamp }}
 
       - name: Discord Notification - Failure
-        if: failure() && github.ref == 'refs/heads/main'
+        if: failure() && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/next-release')
         uses: cal/gitea-actions/discord-notify@main
         with:
           webhook_url: ${{ secrets.DISCORD_WEBHOOK }}