ci: periodically run tests against upstream sqlite

.github/workflows/upstream.yml

@@ -0,0 +1,23 @@
+name: upstream
+concurrency:
+  group: "${{github.workflow}}-${{github.ref}}"
+  cancel-in-progress: true
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 8 * * 1,3,5" # At 08:00 on Monday, Wednesday, and Friday # https://crontab.guru/#0_8_*_*_1,3,5
+
+jobs:
+  sqlite-head:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: |
+          git clone --depth=1 https://github.com/sqlite/sqlite
+          git -C sqlite log -n1
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.1"
+          bundler-cache: true
+      - run: bundle exec rake compile -- --with-sqlite-source-dir=${GITHUB_WORKSPACE}/sqlite
+      - run: bundle exec rake test