chore(ci): implement publishing docs to hdk.zama.ai on push to main

.github/workflows/continuous-integration.yaml

@@ -1,6 +1,9 @@
-name: hdk PR checks
-
-on: [pull_request]
+name: HDK CI Pipeline
+on:
+  pull_request:
+  push:
+    branches:
+      - main
 
 jobs:
   build:
@@ -104,3 +107,50 @@ jobs:
           SLACK_MESSAGE: 'Build finished with status ${{ job.status }}'
           SLACK_USERNAME: zama-bot
           SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+
+  publish-docs:
+    needs: [build]
+
+    runs-on: ubuntu-20.04
+    if: ${{ github.event_name == 'push' && github.base_ref == 'main' }}
+
+    steps:
+      - name: Download Documentation
+        id: download
+        uses: actions/download-artifact@v2
+        with:
+          name: html-docs
+
+      - name: Publish Documentation to S3
+        id: publish
+        if: ${{ steps.download.outcome == 'success' && !cancelled() }}
+        uses: jakejarvis/s3-sync-action@master
+        with:
+          args: --delete
+        env:
+          AWS_S3_BUCKET: ${{ secrets.AWS_HDK_DOCUMENTATION_BUCKET_NAME }}
+          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+          AWS_REGION: ${{ secrets.AWS_REGION }}
+          SOURCE_DIR: '.'
+
+      - name: Invalidate CloudFront Cache
+        if: ${{ steps.publish.outcome == 'success' }}
+        uses: awact/cloudfront-action@master
+        env:
+          SOURCE_PATH: '/*'
+          AWS_REGION: ${{ secrets.AWS_REGION }}
+          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+          DISTRIBUTION_ID: ${{ secrets.AWS_HDK_DOCUMENTATION_DISTRIBUTION_ID }}
+
+      - name: Slack Notification
+        if: ${{ always() }}
+        uses: rtCamp/action-slack-notify@v2
+        env:
+          SLACK_CHANNEL: hdk-updates
+          SLACK_ICON: https://pbs.twimg.com/profile_images/1274014582265298945/OjBKP9kn_400x400.png
+          SLACK_COLOR: ${{ job.status }}
+          SLACK_MESSAGE: 'Publishing documentation finished with status ${{ job.status }}'
+          SLACK_USERNAME: zama-bot
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}