Use versions for build steps.

.gitea/workflows/release.yml

@@ -29,7 +29,7 @@ jobs:
         run: chmod -R 777 pdf
 
       - name: Log into registry
-        uses: docker/login-action
+        uses: docker/login-action@v3
         with:
           registry: cs-registry.ddnss.de
           username: ${{ env.USER }}
@@ -37,13 +37,13 @@ jobs:
 
       - name: Extract Docker metadata
         id: meta
-        uses: docker/metadata-action
+        uses: docker/metadata-action@v5
         with:
           images: ${{ env.REGISTRY }}/ri-st/startup
 
       - name: Build and push Docker image
         id: build-and-push
-        uses: docker/build-push-action
+        uses: docker/build-push-action@v5
         with:
           context: .
           tags: ${{ steps.meta.outputs.tags }}