[CI] Ensure proper exit code handling in coverage build step

[SigureMo]

PR Category

Execute Infrastructure

PR Types

Bug fixes

Description

修复 #77174 后在 make 后添加 ccache -s 命令导致编译退出码无法正确传递的问题，这会导致 H-Coverage 编译失败无法正确退出

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Pull request overview

This PR fixes a bug in the H-Coverage CI workflow where the exit code from the make command was not properly propagated after adding a ccache -s command. The fix ensures that compilation failures are correctly detected and cause the workflow to fail as expected.

Key Changes

• Captures the exit code from make -j20 before running ccache -s
• Explicitly exits with the captured exit code to ensure proper failure detection

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