data/reusables/code-scanning/autobuild-add-build-steps.md

If autobuild fails, or you want to analyze a different set of source files from those built by the autobuild process, you'll need to do the following:

• If your workflow specifies a build mode for the language, change the build mode to manual.
• If your workflow contains an autobuild step, remove or comment out the autobuild step in the workflow.

Then uncomment the run step and manually specify the build process to use. For {% data variables.code-scanning.manual_build_support %}, {% data variables.product.prodname_codeql %} will analyze whatever source code is built by your specified build steps.