Optimize CI/CD workflows by prioritizing reliability over convenience and leveraging built-in platform features. When workflows generate files or have complex dependencies, use brute-force approaches like `make clean; make` to ensure reproducible builds, even if it seems inefficient. Simplify workflow steps by using native GitHub Actions features instead of manual workarounds - for example, use `submodules: true` in checkout actions rather than separate submodule checkout steps. Look for opportunities to consolidate similar workflows that perform redundant operations, as this can reduce maintenance overhead and improve build times. When making dependency changes, consider the overall impact on workflow performance and whether jobs can be parallelized or merged. Example of reliable build verification: ```yaml - name: Check GitHub workflow files are up to date working-directory: .github/workflows run: | sudo apt-get update sudo apt-get install jsonnet make clean # Ensure clean state make # Regenerate all files ``` Example of using built-in features: ```yaml - uses: actions/checkout@v3 with: submodules: true # Instead of separate checkout steps ```