Update docker/build-push-action digest to f8bc7f4

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@f8bc7f46003ef0cf98b715743d86c2f1ccd01436
         with:
           context: .
           push: true