Create packages.element.io directory index scripts (#456)

.github/workflows/packages_index.yaml

@@ -0,0 +1,43 @@
+name: Generate packages.element.io directory indexes
+on:
+  # Trigger a rebuild of all indexes if the template gets updated
+  push:
+    branches: [ develop ]
+    paths:
+      - 'packages.element.io/**'
+  # Trigger a daily rebuild for nightlies
+  schedule:
+    - cron: '0 11 * * *'
+  # Manual trigger for rebuilding for releases
+  workflow_dispatch: { }
+jobs:
+  deploy:
+    name: "Deploy"
+    runs-on: ubuntu-latest
+    environment: develop
+    env:
+      R2_BUCKET: 'packages-element-io'
+      R2_URL: ${{ secrets.CF_R2_S3_API }}
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-node@v3
+        with:
+          cache: "yarn"
+
+      - name: Install Deps
+        run: "yarn install --pure-lockfile"
+
+      - name: Copy static files
+        if: github.event_name == 'push'
+        run: aws s3 cp --recursive package packages.element.io/ s3://$R2_BUCKET/ --endpoint-url $R2_URL --region auto
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.CF_R2_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.CF_R2_TOKEN }}
+
+      - name: Generate directory indexes
+        run: scripts/generate-package-index.ts
+        env:
+          CF_R2_S3_API: ${{ secrets.CF_R2_S3_API }}
+          CF_R2_ACCESS_KEY_ID: ${{ secrets.CF_R2_ACCESS_KEY_ID }}
+          CF_R2_TOKEN: ${{ secrets.CF_R2_TOKEN }}