feat: pr tag

Author: johnnyreilly

.github/workflows/shared-build-and-deploy.yaml

@@ -59,6 +59,7 @@ jobs:
             type=semver,pattern={{major}}.{{minor}}
             type=semver,pattern={{major}}
             type=ref,event=branch
+            type=ref,event=pr
             type=sha
 
       # Build and push Docker image with Buildx (don't push on PR)