Use specific and latest version in actions x2

.github/workflows/docker.yaml

@@ -11,22 +11,22 @@ jobs:
 
     steps:
       - name: Check out the repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.4.0
 
       - name: Log in to Docker Hub
-        uses: docker/login-action@v1
+        uses: docker/login-action@v1.12.0
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v3.6.2
         with:
           images: ajbura/cinny
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v2.8.0
         with:
           context: .
           push: true