Standardise CI (#124)

Author: eddeee888

.github/workflows/ci.yml

@@ -1,22 +1,22 @@
 name: CI
+
 on:
-  push:
-    branches-ignore:
-      - "master"
+  pull_request:
+    branches:
+      - master
+
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 env:
-  node-version: "22"
+  node-version: "22.x"
 
 jobs:
   test:
     name: Test
     runs-on: ubuntu-24.04
     steps:
-      - name: Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.12.1
-        with:
-          access_token: ${{ github.token }}
-
       - name: Check out repository
         uses: actions/checkout@v4
         with:
@@ -30,7 +30,16 @@ jobs:
           cache-dependency-path: "**/yarn.lock"
 
       - name: Install deps
-        run: yarn install --prefer-offline
+        run: yarn install --prefer-offline --frozen-lockfile
+
+      - name: Cache node_modules
+        uses: actions/cache@v4
+        id: cache-node-modules
+        with:
+          path: node_modules
+          key: node-modules-${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            node-modules-${{ runner.os }}-
 
       - name: Codegen & check
         run: ./bin/codegen-check.sh