Fix Docker action (#5106)

Co-authored-by: Martin Haug <mhaug@live.de>

.github/workflows/docker-image.yml

@@ -33,7 +33,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Get current date
-        run: echo "TYPST_BUILD_DATE=\"$(date -u +'%Y-%m-%dT%H:%M:%SZ')\" >> ${GITHUB_ENV}"
+        run: echo "TYPST_BUILD_DATE=\"$(date -u +'%Y-%m-%dT%H:%M:%SZ')\" >> $GITHUB_ENV"
 
       - name: Setup Docker buildx
         uses: docker/setup-buildx-action@v3.1.0
@@ -85,6 +85,11 @@ jobs:
     runs-on: ubuntu-latest
     needs:
       - build
+
+    permissions:
+      contents: read
+      packages: write
+
     steps:
       - name: Prepare
         run: |