Fix workflow

.github/workflows/docker-publish.yml

@@ -1,12 +1,9 @@
 name: Docker
 
-# GitHub Actions workflow for building, tagging, and pushing Docker images,
-# with version signing using cosign.
-
 on:
   push:
-    branches: [ "main" ]
-    tags: [ 'v*.*.*' ]
+    branches: ["main"]
+    tags: ["v*.*.*"]
 
 env:
   REGISTRY: ghcr.io
@@ -25,15 +22,12 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v3
 
-      - name: Install cosign
-        uses: sigstore/[email protected]
-        with:
-          cosign-release: 'v2.1.1'
-
-      - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@v2
+      - name: Setup Docker and cosign
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y buildx cosign
 
-      - name: Log into registry ${{ env.REGISTRY }}
+      - name: Log into registry
         uses: docker/login-action@v2
         with:
           registry: ${{ env.REGISTRY }}