Add script to check whether npm i needs to be run

package.json

@@ -5,7 +5,7 @@
   "description": "CodeQL action",
   "scripts": {
     "_build_comment": "echo 'Run the full build so we typecheck the project and can reuse the transpiled files in npm test'",
-    "build": "npm run transpile && node build.mjs",
+    "build": "./scripts/check-node-modules.sh && npm run transpile && node build.mjs",
     "lint": "eslint --report-unused-disable-directives --max-warnings=0 .",
     "lint-ci": "SARIF_ESLINT_IGNORE_SUPPRESSED=true eslint --report-unused-disable-directives --max-warnings=0 . --format @microsoft/eslint-formatter-sarif --output-file=eslint.sarif",
     "lint-fix": "eslint --report-unused-disable-directives --max-warnings=0 . --fix",

scripts/check-node-modules.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -e
+
+# Check if npm install is likely needed before proceeding
+if [ ! -d node_modules ] || [ package-lock.json -nt node_modules/.package-lock.json ]; then
+  npm install
+fi