fix(ci): don't login to docker registry for PRs

.github/workflows/test.yml

@@ -517,12 +517,14 @@ jobs:
         uses: docker/setup-buildx-action@v1
 
       - name: Login to DockerHub
+        if: github.event_name != 'pull_request'
         uses: docker/login-action@v1
         with:
           username: lmierzwa
           password: ${{ secrets.DOCKER_HUB_PASSWORD }}
 
       - name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request'
         uses: docker/login-action@v1
         with:
           registry: ghcr.io