bump version of action

while here, adjust formatting

Signed-off-by: Felix Kronlage-Dammers <fkr@hazardous.org>

Author: fkr

.github/workflows/build-docker.yml

@@ -5,7 +5,7 @@ name: Build and publish scs-compliance-check Docker image
   workflow_dispatch:
   push:
     branches:
-    - main
+      - main
     paths:
       - 'Tests/**'
 
@@ -48,7 +48,7 @@ jobs:
             type=sha
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: "./Tests/"
           platforms: linux/amd64,linux/arm64