Update codeql.yml

Explicitly suggest that users add their setup steps before calling init.

code-scanning/codeql.yml

@@ -55,6 +55,12 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v4
 
+    # Add any setup steps before running the `github/codeql-action/init` action.
+    # This includes steps like installing compilers or runtimes (`actions/setup-node` 
+    # or others). This is typically only required for manual builds.
+    # - name: Setup runtime
+    #   uses: actions/setup-XXX@vXXX
+
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v3