add RLI checker workflow

.github/workflows/launch-inspector.yml

@@ -0,0 +1,28 @@
+name: Launch Inspector
+on: [pull_request]
+
+jobs:
+  launch:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout frc-docs
+        uses: actions/checkout@v2
+        with:
+          repository: wpilibsuite/frc-docs
+          path: frc-docs
+          token: ${{ secrets.GH_ADMIN_TOKEN }}
+
+      - name: Inspect RLIs
+        uses: Starlight220/[email protected]
+        id: inspector
+        with:
+          root: frc-docs
+          baseUrl: 'https://raw.githubusercontent.com/wpilibsuite/allwpilib/'
+          versionScheme: 'v\d{4}\.\d\.\d(?:-(?:alpha|beta)-\d)?|[0-9a-f]{40}'
+          latestVersion: ${{ github.sha }}
+          ignoredFiles: '["source/docs/software/pathplanning/trajectory-tutorial/"]'
+
+      # Error if RLIs can't be automatically updated
+      - name: Set exit code
+        if: ${{ steps.inspector.outputs.needs-manual == false }}
+        run: exit 1