ci: add just ci for pull request checks

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install just
+        uses: extractions/setup-just@v3
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Restore cargo cache
+        uses: Swatinem/rust-cache@v2
+
+      - name: Run checks
+        run: just ci

CONTRIBUTING.md

@@ -48,10 +48,10 @@ If you plan to implement the change yourself, say that directly in the issue and
 
 ## Before submitting a PR
 
-Run the project checks and make sure they pass.
+Run the PR checks and make sure they pass.
 
 ```bash
-just check
+just ci
 ```
 
 Do not open a PR that bypasses failing tests, formatting, or build errors.

justfile

@@ -5,10 +5,13 @@ test:
     cargo test
     python3 -m unittest scripts.test_changelog scripts.test_vendor_libghostty_vt
 
-# Check formatting + run unit tests
-check:
+# Run PR CI checks
+ci:
     cargo fmt --check
     cargo test
+
+# Check formatting + run unit tests + maintenance script tests
+check: ci
     python3 -m unittest scripts.test_changelog scripts.test_vendor_libghostty_vt
 
 # Run the full local test suite