Update docker/build-push-action digest to 502612d

Author: renovate[bot]

.github/workflows/publish.yml

@@ -38,7 +38,7 @@ jobs:
 
       - name: Build and push Docker image
         id: push
-        uses: docker/build-push-action@c566248492c912e39910ac79e2f05a82260233a8
+        uses: docker/build-push-action@502612d46437e573ecd598d11dd0b009741ed5cd
         with:
           context: .
           push: true