Add valgrind to CI

Fixes: #71

Author: saghul

.github/workflows/ci.yml

@@ -241,6 +241,20 @@ jobs:
       - name: stats
         run: |
           make stats
+  linux-valgrind:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: install valgrind
+        run: sudo apt-get install valgrind
+      - name: build
+        run: |
+          make BUILD_TYPE=RelWithDebInfo
+      - name: test
+        run: |
+          valgrind --leak-check=full --show-leak-kinds=all --error-exitcode=1 ./build/run-test262 -m -c test262.conf -a
 
   macos:
     runs-on: macos-latest