Make CI fuzzing a container task

.github/workflows/fuzz.yaml

@@ -22,23 +22,16 @@ jobs:
     name: Parser fuzzing
     runs-on: ubuntu-latest
     timeout-minutes: 25
+    # Run in a container because we had some issues reproducing failures
+    container:
+      image: debian:bookworm
     steps:
       - uses: actions/checkout@v4
-      - uses: taiki-e/install-action@just
-      - name: Get npm cache directory
-        id: npm-cache-dir
-        shell: bash
-        run: echo "dir=$(npm config get cache)" >> ${GITHUB_OUTPUT}
-      - uses: actions/cache@v4
-        id: npm-cache
-        with:
-          path: ${{ steps.npm-cache-dir.outputs.dir }}
-          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: ${{ runner.os }}-node-
       - run: |
-          npm --version
-          npx --version
-          clang --version
+          apt update
+          apt install -y clang curl
+          curl --proto '=https' --tlsv1.2 -sSf https://just.systems/install.sh |
+            bash -s -- --to /usr/bin          
       - run: just setup
       - run: just fuzz
       - name: Print failures

justfile

@@ -53,7 +53,11 @@ setup:
 	check_installed clang-tidy
 	check_installed clang-format
 
-	npm install --include=dev
+	if which npm > /dev/null; then
+		npm install --include=dev
+	else
+		echo "npm not found: skipping install"
+	fi
 
 # Lint with more minimal dependencies that can be run during pre-commit
 _lint-min: tree-sitter-clone configure-compile-database