ci: scheduled shared assets rsync

.github/workflows/dev-assets-sync-nightly.yml

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+# GITHUB ACTIONS - WORKFLOW
+
+# RSync the assets in the shared assets volume
+
+name: Nightly Dev Shared Assets Sync
+
+# Controls when the workflow will run
+on:
+  # Run every night
+  schedule:
+    - cron: '0 1 * * *'
+
+  # Run on app-rsync-extras.sh changes
+  push:
+    branches:
+      - main
+    paths:
+      - 'docker/scripts/app-rsync-extras.sh'
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build Docker Image
+    runs-on: ubuntu-latest
+    if: ${{ github.event_name != 'schedule' }}
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker Build & Push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: dev/shared-assets-sync/Dockerfile
+          push: true
+          tags: ghcr.io/ietf-tools/datatracker-rsync-assets:latest
+          
+  sync:
+    name: Run assets rsync
+    if: ${{ always() }}
+    runs-on: dev-server
+    needs: [build]
+    steps:
+    - name: Run rsync
+      env:
+        DEBIAN_FRONTEND: noninteractive
+      run: |
+        docker pull ghcr.io/ietf-tools/datatracker-rsync-assets:latest
+        docker run --rm -v dt-assets:/assets ghcr.io/ietf-tools/datatracker-rsync-assets:latest
+        docker image prune -a -f

dev/shared-assets-sync/Dockerfile

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+FROM alpine:3
+
+RUN apk add --no-cache wget rsync
+COPY docker/scripts/app-rsync-extras.sh /workspace/app-rsync-extras.sh
+RUN chmod +x /workspace/app-rsync-extras.sh
+
+WORKDIR /workspace
+
+CMD ["sh", "app-rsync-extras.sh"]