docs: add github action workflows to update README on DockerHub

Signed-off-by: Dusan Malusev <dusan.malusev@scylladb.com>

.github/workflows/docker.yml

@@ -14,7 +14,7 @@ on:
         description: ''
         type: string
       platforms:
-        default: linux/amd64,linux/arm64
+        default: linux/amd64,linux/arm64/v8
         required: false
         description: ''
         type: string
@@ -34,7 +34,7 @@ on:
         required: false
         type: string
       platforms:
-        default: linux/amd64,linux/arm64
+        default: linux/amd64,linux/arm64/v8
         required: false
         type: string
       image:
@@ -66,8 +66,8 @@ jobs:
         uses: docker/login-action@v3
         with:
           registry: ${{ secrets.REGISTRY }}
-          username: ${{ secrets.REGISTRY_USERNAME }}
-          password: ${{ secrets.REGISTRY_TOKEN }}
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password:  ${{ secrets.DOCKERHUB_TOKEN }}
       - name: Build and push API
         uses: docker/build-push-action@v5
         with:

.github/workflows/dockerhub-description.yml

@@ -0,0 +1,22 @@
+name: Update Docker Hub Description
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - README.md
+      - .github/workflows/dockerhub-description.yml
+jobs:
+  description:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Docker Hub Description
+      uses: peter-evans/dockerhub-description@v4
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password:  ${{ secrets.DOCKERHUB_TOKEN }}
+        repository: scylladb/cassandra-stress
+        short-description: ${{ github.event.repository.description }}
+        enable-url-completion: true