Worked on the openclaw/openclaw repository to enhance the reliability of automated security verification during Docker image builds. Addressed a bug in the Dockerfile’s GPG fingerprint check by correcting awk quoting, which previously led to incorrect fingerprint detection and potential security risks. Added targeted test coverage for workflows with OPENCLAW_SANDBOX enabled, ensuring the fix was robust and future regressions could be detected early. Utilized Shell scripting and Docker expertise to improve build stability and reduce the risk of fingerprint misdetection. Focused on testing and automation, the work delivered more dependable security checks without introducing new features during the period.