feat: don't deploy on PRs, change PR docker image naming scheme

.github/workflows/build.yaml

@@ -59,11 +59,11 @@ jobs:
         run: |
           tag_prefix="ghcr.io/emortalmc/${{ matrix.service }}"
           tags=""
-
-          if [[ "${{ github.ref }}" == "refs/heads/main" ]]; then
+          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
+            short_sha=$(echo "${{ github.event.pull_request.head.sha }}" | cut -c1-7)
+            tags="$tag_prefix:pr-${{ github.event.number }}-$short_sha"
+          elif [[ "${{ github.ref }}" == "refs/heads/main" ]]; then
             tags="$tag_prefix:${{ github.sha }},$tag_prefix:latest"
-          elif [[ "${{ github.event_name }}" == "pull_request" ]]; then
-            tags="$tag_prefix:pr-${{ github.event.number }},$tag_prefix:${{github.event.pull_request.head.sha}}"
           fi
 
           echo "DOCKER_TAGS=$tags" >> "$GITHUB_ENV"
@@ -90,6 +90,7 @@ jobs:
   deploy:
     needs: [build-and-publish, detect-services]
     runs-on: ubuntu-latest
+    if: github.event_name != 'pull_request' && github.ref == 'refs/heads/main' # Only run on main branch, non-PR pushes
     env:
       SERVICES: ${{ needs.detect-services.outputs.services }}
     steps: