ci: add dev tag trigger to Docker build workflow

Allows deploying to dev environment by pushing a "dev" tag.
Dev tags build with :dev Docker tag instead of :production.

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

.gitea/workflows/docker-build.yml

@@ -1,11 +1,13 @@
 # Gitea Actions: Docker Build, Push, and Notify
 #
 # CI/CD pipeline for Paper Dynasty Discord Bot:
-# - Triggered by pushing a CalVer tag (e.g., 2026.3.11)
-# - Builds Docker image and pushes to Docker Hub with version + production tags
+# - 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
 
@@ -13,6 +15,7 @@ on:
   push:
     tags:
       - '20*'  # matches CalVer tags like 2026.3.11
+      - 'dev'  # dev environment builds
 
 jobs:
   build:
@@ -32,6 +35,11 @@ jobs:
           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
@@ -49,7 +57,7 @@ jobs:
           push: true
           tags: |
             manticorum67/paper-dynasty-discordapp:${{ steps.version.outputs.version }}
-            manticorum67/paper-dynasty-discordapp:production
+            manticorum67/paper-dynasty-discordapp:${{ steps.version.outputs.environment }}
           cache-from: type=registry,ref=manticorum67/paper-dynasty-discordapp:buildcache
           cache-to: type=registry,ref=manticorum67/paper-dynasty-discordapp:buildcache,mode=max
 
@@ -61,7 +69,7 @@ jobs:
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "**Image Tags:**" >> $GITHUB_STEP_SUMMARY
           echo "- \`manticorum67/paper-dynasty-discordapp:${{ steps.version.outputs.version }}\`" >> $GITHUB_STEP_SUMMARY
-          echo "- \`manticorum67/paper-dynasty-discordapp:production\`" >> $GITHUB_STEP_SUMMARY
+          echo "- \`manticorum67/paper-dynasty-discordapp:${{ steps.version.outputs.environment }}\`" >> $GITHUB_STEP_SUMMARY
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "**Build Details:**" >> $GITHUB_STEP_SUMMARY
           echo "- Commit: \`${{ steps.version.outputs.sha_short }}\`" >> $GITHUB_STEP_SUMMARY