[FEATURE] Add ddclient

Author: IanSun

.github/workflows/ddclient.yaml

@@ -0,0 +1,51 @@
+name: ddclient
+
+on:
+  push:
+    paths:
+    - ddclient/**
+  schedule:
+  - cron: 0 0 * * *
+  workflow_dispatch:
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.version.outputs.version }}
+    steps:
+    - uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+    - id: version
+      env:
+        DOCKER_CLI_EXPERIMENTAL: enabled
+      run: |
+        export VERSION=$(curl https://dl-cdn.alpinelinux.org/alpine/edge/testing/x86_64/APKINDEX.tar.gz | tar -Oxz | grep -FaxA1 "P:ddclient" | tail -n1 | cut -d: -f2)
+        docker manifest inspect ${{ secrets.DOCKERHUB_USERNAME }}/ddclient:${VERSION} > /dev/null && echo "" || echo "::set-output name=version::${VERSION}"
+  publish:
+    needs: update
+    if: ${{ needs.update.outputs.version }}
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: docker/setup-qemu-action@v1
+    - uses: docker/setup-buildx-action@v1
+    - uses: docker/login-action@v1
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+    - uses: docker/build-push-action@v2
+      with:
+        build-args: |
+          VERSION=${{ needs.update.outputs.version }}
+        context: ddclient
+        file: ddclient/Dockerfile
+        platforms: |
+          linux/amd64
+          linux/arm64
+        push: true
+        tags: |
+          ${{ secrets.DOCKERHUB_USERNAME }}/ddclient
+          ${{ secrets.DOCKERHUB_USERNAME }}/ddclient:${{ needs.update.outputs.version }}

ddclient/Dockerfile

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+FROM alpine:edge
+
+ARG VERSION
+
+RUN set -ex; \
+  echo "https://dl-cdn.alpinelinux.org/alpine/edge/testing" | tee -a "/etc/apk/repositories"; \
+  apk add --no-cache ddclient="${VERSION}"
+
+VOLUME [ "/etc/ddclient" ]
+
+CMD [ "/usr/bin/ddclient", "-foreground" ]