chore(dependencies): update docker/build-push-action digest to 21fe05f

Author: renovate[bot]

.github/workflows/docker.yml

@@ -31,7 +31,7 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@a3ae207c1434ab875aa11554ce639ff512f25e89
+        uses: docker/build-push-action@21fe05ff59fb571c2235e85e77b415a50c24fa11
         with:
           context: .
           push: true