ci: add corpus test

Problem: PRs are not tested against the variety of queries in the wild.

Solution: Include a corpus test using nvim-treesitter's queries.

Author: clason

.github/workflows/ci.yml

@@ -42,6 +42,30 @@ jobs:
         id: toolchain
       - run: cargo test
 
+  corpus:
+    name: Corpus test
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@1.86.0
+        id: toolchain
+        run: cargo build
+
+      - name: Clone nvim-treesitter runtime corpus
+        uses: actions/checkout@v4
+        with:
+          repository: nvim-treesitter/nvim-treesitter
+          ref: main
+          path: .tests/nvim-treesitter
+          sparse-checkout: runtime/queries
+
+      - name: Check corpus
+        run: ts_query_ls check .tests/nvim-treesitter/runtime/queries
+
+      - name: Format corpus
+        run: ts_query_ls format .tests/nvim-treesitter/runtime/queries
+
   generate-schema:
     name: Generate schema
     runs-on: ubuntu-latest