Update GitHub Actions workflow to set permissions for contents and packages

Author: dominikpeter

.github/workflows/docker-build.yaml

@@ -7,6 +7,10 @@ on:
             - main
             - dev
 
+permissions:
+    contents: read
+    packages: write
+
 jobs:
     build-main-image:
         uses: ./.github/workflows/build-docker-image.yaml
@@ -57,4 +61,4 @@ jobs:
             image_name: ${{ github.repository }}
             cache_id: minimum
             extract_flavor: suffix=-minimum,onlatest=true
-            extract_tags: type=raw,enable=${{ github.ref == 'refs/heads/main' }},prefix=,suffix=,value=minimum
+            extract_tags: type=raw,enable=${{ github.ref == 'refs/heads/main' }},prefix=,suffix=,value=minimum