Update docker/build-push-action digest to 6003d32

Author: renovate[bot]

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
           images: mountainash/openssh-client
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@af5a7ed5ba88268d5278f7203fb52cd833f66d6e
+        uses: docker/build-push-action@6003d3266a923de06063d23a19bd1c719af997c0
         with:
           context: .
           push: true