removed main tag generation, changed command to delete only current p…

…r's tag

.github/workflows/docker-image.yml

@@ -32,7 +32,6 @@ jobs:
             rob93c/stickerify
           tags: |
             type=raw,value=latest,enable={{is_default_branch}}
-            type=ref,event=branch
             type=ref,event=pr
 
       - name: Upload Docker image
@@ -44,14 +43,9 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
 
-      - name: Delete Docker tags
-        if: github.ref == 'refs/heads/main'
+      - name: Delete Docker tag
+        if: github.event.pull_request.merged
         run: |
-          tags_to_keep=("latest" "native")
-          tags=$(curl -s "https://hub.docker.com/v2/repositories/rob93c/stickerify/tags/" | jq -r '.results[].name')
-
-          for tag in $tags; do
-            if [[ ! " ${tags_to_keep[@]} " =~ " ${tag} " ]]; then
-              docker rmi rob93c/stickerify:$tag
-            fi
-          done
+          tag_to_delete="pr-${{github.event.issue.number}}"
+          docker rmi rob93c/stickerify:$tag_to_delete
+          echo "The tag $tag_to_delete has been deleted"