workflow: add workflow to convert top docker hub images

So that we can use them in CI and ref to users to test with.

Signed-off-by: Peng Tao <[email protected]>

.github/workflows/convert.yml

@@ -0,0 +1,41 @@
+name: Convert Top Docker Hub Images
+
+on:
+  push:
+    branches: ["*"]
+
+env:
+  CARGO_TERM_COLOR: always
+  REGISTRY: ghcr.io
+  #MAGE_NAME: ${{ github.repository }}
+  ORGANIZATION: ${{ github.repository }}
+  #ORGANIZATION: nydus-cloudnative
+
+jobs:
+  convert-images:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+      - name: Install Nydus Binaries
+        run: |
+          wget https://github.com/dragonflyoss/image-service/releases/download/v1.1.1/nydus-static-v1.1.1-x86_64.tgz
+          tar xzf nydus-static-v1.1.1-x86_64.tgz
+          sudo cp nydus-static/nydusify nydus-static/nydus-image /usr/local/bin/
+      - name: Log in to the container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Convert Images
+        run: |
+          cat ~/.docker/config.json
+          docker pull ubuntu:latest
+          docker tag ubuntu:latest ${{ env.REGISTRY }}/${{ env.ORGANIZATION }}/ubuntu:latest
+          echo docker push ${{ env.REGISTRY }}/${{ env.ORGANIZATION }}/ubuntu:latest
+          docker push ${{ env.REGISTRY }}/${{ env.ORGANIZATION }}/ubuntu:latest
+          echo sudo nydusify convert --source ubuntu:latest --target ${{ env.REGISTRY }}/${{ env.ORGANIZATION }}/ubuntu:nydus-latest
+          sudo nydusify convert --source ubuntu:latest --target ${{ env.REGISTRY }}/${{ env.ORGANIZATION }}/ubuntu:nydus-latest
+
+