actions: Add docker publisher job.

.github/workflows/publish_docker.yml

@@ -0,0 +1,38 @@
+name: Build Docker Image and Publish on Docker Hub
+
+on:
+  workflow_dispatch:
+  schedule:
+    # every day
+    - cron: "13 21 * * *" # 21:13 UTC
+
+env:
+  CARGO_TERM_COLOR: always
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  # Except in `main` branch! Any cancelled job will cause the
+  # CI run to fail, and we want to keep a clean history for major branches.
+  cancel-in-progress: ${{ (github.ref != 'refs/heads/main') }}
+
+jobs:
+  docker:
+    timeout-minutes: 120
+    name: Build and publish Docker image
+    runs-on: ubicloud-standard-16
+    steps:
+      - uses: actions/checkout@v4
+      - name: Docker Setup Buildx
+        uses: docker/[email protected]
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/[email protected]
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ secrets.DOCKERHUB_USERNAME }}/clementine:latest