ci: split workflows and move pnpm lockfile ownership to GitHub Actions

.github/workflows/refresh-lockfile.yml

@@ -0,0 +1,74 @@
+name: Refresh Lockfile
+
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+
+concurrency:
+  group: refresh-lockfile-master
+  cancel-in-progress: false
+
+jobs:
+  refresh_and_verify:
+    runs-on: ubuntu-latest
+    timeout-minutes: 25
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9.15.4
+          run_install: false
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: pnpm
+
+      - name: Refresh pnpm lockfile
+        run: pnpm install --lockfile-only --ignore-scripts --no-frozen-lockfile
+
+      - name: Fail on unexpected file changes
+        run: |
+          changed="$(git status --porcelain)"
+          if [ -z "$changed" ]; then
+            exit 0
+          fi
+          if printf '%s\n' "$changed" | grep -Fvq ' pnpm-lock.yaml'; then
+            echo "Unexpected files changed during lockfile refresh:"
+            echo "$changed"
+            exit 1
+          fi
+
+      - name: Commit refreshed lockfile
+        run: |
+          if git diff --quiet -- pnpm-lock.yaml; then
+            exit 0
+          fi
+          git config user.name "lockfile-bot"
+          git config user.email "lockfile-bot@users.noreply.github.com"
+          git add pnpm-lock.yaml
+          git commit -m "chore(lockfile): refresh pnpm-lock.yaml"
+          git push
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Typecheck
+        run: pnpm -r typecheck
+
+      - name: Run tests
+        run: pnpm test:run
+
+      - name: Build
+        run: pnpm build