One of the secrets has a name that is not POSIX compliant and hence cannot directly be used/injected as an environment variable name. Therefore, it will be transformed into a POSIX compliant environment variable name. Enable GitHub Actions Debug Logging (https://docs.github.com/en/free-pro-team@latest/actions/managing-workflow-runs/enabling-debug-logging) to see the transformed environment variable name. POSIX compliance: environment variable names can only contain upper case letters, digits and underscores. It cannot begin with a digit.