fix: push image only default branch or tag (#5)

Author: pranc1ngpegasus

.github/workflows/push.yaml

@@ -2,9 +2,12 @@ name: Push
 on:
   push:
     branches:
-      - "**"
+      - main
     tags:
       - "v*.*.*"
+  pull_request:
+    branches:
+      - main
   workflow_dispatch:
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}-push
@@ -32,7 +35,7 @@ jobs:
       - uses: docker/build-push-action@v4.1.1
         with:
           context: .
-          push: true
+          push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha