ci: update workflow to trigger on CalVer tag push

Cherry-pick current docker-build workflow from main so CalVer tags
on this hotfix branch trigger CI builds correctly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/docker-build.yml

@@ -1,31 +1,48 @@
 # Gitea Actions: Docker Build, Push, and Notify
 #
 # CI/CD pipeline for Paper Dynasty Discord Bot:
-# - Builds Docker images on every push/PR
-# - Auto-generates CalVer version (YYYY.MM.BUILD) on main branch merges
-# - Pushes to Docker Hub and creates git tag on main
+# - Triggered by pushing a CalVer tag (e.g., 2026.3.11) or "dev" tag
+# - CalVer tags push with version + "production" Docker tags
+# - "dev" tag pushes with "dev" Docker tag for the dev environment
 # - Sends Discord notifications on success/failure
+#
+# To release: git tag 2026.3.11 && git push origin 2026.3.11
+# To deploy dev: git tag -f dev && git push origin dev --force
 
 name: Build Docker Image
 
 on:
   push:
-    branches:
-      - main
-      - next-release
-  pull_request:
-    branches:
-      - main
+    tags:
+      - '20*'  # matches CalVer tags like 2026.3.11
+      - 'dev'  # dev environment builds
 
 jobs:
   build:
     runs-on: ubuntu-latest
+    container:
+      volumes:
+        - pd-buildx-cache:/opt/buildx-cache
 
     steps:
       - name: Checkout code
         uses: https://github.com/actions/checkout@v4
         with:
-          fetch-depth: 0  # Full history for tag counting
+          fetch-depth: 0
+
+      - name: Extract version from tag
+        id: version
+        run: |
+          VERSION=${GITHUB_REF#refs/tags/}
+          SHA_SHORT=$(git rev-parse --short HEAD)
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          echo "sha_short=$SHA_SHORT" >> $GITHUB_OUTPUT
+          echo "timestamp=$(date -u +%Y-%m-%dT%H:%M:%SZ)" >> $GITHUB_OUTPUT
+          if [ "$VERSION" = "dev" ]; then
+            echo "environment=dev" >> $GITHUB_OUTPUT
+          else
+            echo "environment=production" >> $GITHUB_OUTPUT
+          fi
 
       - name: Set up Docker Buildx
         uses: https://github.com/docker/setup-buildx-action@v3
@@ -36,67 +53,52 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Generate CalVer version
-        id: calver
-        uses: cal/gitea-actions/calver@main
-
-      - name: Resolve Docker tags
-        id: tags
-        uses: cal/gitea-actions/docker-tags@main
-        with:
-          image: manticorum67/paper-dynasty-discordapp
-          version: ${{ steps.calver.outputs.version }}
-          sha_short: ${{ steps.calver.outputs.sha_short }}
-
       - name: Build and push Docker image
         uses: https://github.com/docker/build-push-action@v5
         with:
           context: .
           push: true
-          tags: ${{ steps.tags.outputs.tags }}
-          cache-from: type=registry,ref=manticorum67/paper-dynasty-discordapp:buildcache
-          cache-to: type=registry,ref=manticorum67/paper-dynasty-discordapp:buildcache,mode=max
+          tags: |
+            manticorum67/paper-dynasty-discordapp:${{ steps.version.outputs.version }}
+            manticorum67/paper-dynasty-discordapp:${{ steps.version.outputs.environment }}
+          cache-from: type=local,src=/opt/buildx-cache/pd-discord
+          cache-to: type=local,dest=/opt/buildx-cache/pd-discord-new,mode=max
 
-      - name: Tag release
-        if: success() && steps.tags.outputs.channel == 'stable'
-        uses: cal/gitea-actions/gitea-tag@main
-        with:
-          version: ${{ steps.calver.outputs.version }}
-          token: ${{ github.token }}
+      - name: Rotate cache
+        run: |
+          rm -rf /opt/buildx-cache/pd-discord
+          mv /opt/buildx-cache/pd-discord-new /opt/buildx-cache/pd-discord
 
       - name: Build Summary
         run: |
           echo "## Docker Build Successful" >> $GITHUB_STEP_SUMMARY
           echo "" >> $GITHUB_STEP_SUMMARY
-          echo "**Channel:** \`${{ steps.tags.outputs.channel }}\`" >> $GITHUB_STEP_SUMMARY
+          echo "**Version:** \`${{ steps.version.outputs.version }}\`" >> $GITHUB_STEP_SUMMARY
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "**Image Tags:**" >> $GITHUB_STEP_SUMMARY
-          IFS=',' read -ra TAG_ARRAY <<< "${{ steps.tags.outputs.tags }}"
-          for tag in "${TAG_ARRAY[@]}"; do
-            echo "- \`${tag}\`" >> $GITHUB_STEP_SUMMARY
-          done
+          echo "- \`manticorum67/paper-dynasty-discordapp:${{ steps.version.outputs.version }}\`" >> $GITHUB_STEP_SUMMARY
+          echo "- \`manticorum67/paper-dynasty-discordapp:${{ steps.version.outputs.environment }}\`" >> $GITHUB_STEP_SUMMARY
           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 }}\`" >> $GITHUB_STEP_SUMMARY
+          echo "- Commit: \`${{ steps.version.outputs.sha_short }}\`" >> $GITHUB_STEP_SUMMARY
+          echo "- Timestamp: \`${{ steps.version.outputs.timestamp }}\`" >> $GITHUB_STEP_SUMMARY
           echo "" >> $GITHUB_STEP_SUMMARY
-          echo "Pull with: \`docker pull manticorum67/paper-dynasty-discordapp:${{ steps.tags.outputs.primary_tag }}\`" >> $GITHUB_STEP_SUMMARY
+          echo "Pull with: \`docker pull manticorum67/paper-dynasty-discordapp:${{ steps.version.outputs.version }}\`" >> $GITHUB_STEP_SUMMARY
 
       - name: Discord Notification - Success
-        if: success() && steps.tags.outputs.channel != 'dev'
+        if: success()
         uses: cal/gitea-actions/discord-notify@main
         with:
           webhook_url: ${{ secrets.DISCORD_WEBHOOK }}
           title: "Paper Dynasty Bot"
           status: success
-          version: ${{ steps.calver.outputs.version }}
-          image_tag: ${{ steps.calver.outputs.version_sha }}
-          commit_sha: ${{ steps.calver.outputs.sha_short }}
-          timestamp: ${{ steps.calver.outputs.timestamp }}
+          version: ${{ steps.version.outputs.version }}
+          image_tag: ${{ steps.version.outputs.version }}
+          commit_sha: ${{ steps.version.outputs.sha_short }}
+          timestamp: ${{ steps.version.outputs.timestamp }}
 
       - name: Discord Notification - Failure
-        if: failure() && steps.tags.outputs.channel != 'dev'
+        if: failure()
         uses: cal/gitea-actions/discord-notify@main
         with:
           webhook_url: ${{ secrets.DISCORD_WEBHOOK }}