Fix

The mismatch is usually caused by environment variable differences, specifically GODEBUG settings or CGO_ENABLED, which control runtime behavior and compilation flags. Run go env in both your local terminal and the CI logs to compare values like GODEBUG, CGO_ENABLED, and GOOS. If GODEBUG differs, add a godebug directive to your go.mod file to enforce consistent defaults across environments:

godebug (
  default=go1.21
  panicnil=1
)

If the issue involves C dependencies, ensure CGO_ENABLED is set to 1 in CI or install the required system libraries (e.g., gcc, glibc) in your CI runner.

Your code behaves differently because the computer running your tests (CI) has different settings than your own computer. Think of it like a recipe that works in your kitchen but fails in a restaurant because the oven temperature or ingredients are slightly different. You need to explicitly tell the CI system to use the exact same settings you use locally.