feat(components/execd): replace sh to bash under bootstrap

[Pangjiping]

Summary

• Replace sh to bash under bootstrap
• At the beginning we used sh for maximum compatibility, but I noticed that run_command in execd is still invoked via bash, so we’ve effectively been assuming that the user’s base image includes bash all along. Therefore I’m going to change the shebang in bootstrap.sh to bash as well, so we can use more modern syntax.

Testing

• Not run (explain why)
• Unit tests
• Integration tests
• e2e / manual verification

Breaking Changes

• None
• Yes (describe impact and migration path)

Checklist

• Linked Issue or clearly described motivation
• Added/updated docs (if needed)
• Added/updated tests (if needed)
• Security impact considered
• Backward compatibility considered

[jwx0925]

@codex review

[chatgpt-codex-connector]

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[ninan-nn]

LGTM