🛡️ Sentinel: Fix password truncation in entrypoint script

[google-labs-jules]

🛡️ Sentinel: [CRITICAL] Fix password truncation and command injection risks in entrypoint

🚨 Severity: CRITICAL
💡 Vulnerability: Unquoted variable expansion in copyables/entrypoint.sh caused passwords containing spaces to be truncated (e.g., "correct horse battery staple" became "correct"). It also posed a risk of command injection/globbing if usernames contained special characters.
🎯 Impact: Users setting strong passphrases would silently end up with weak passwords (the first word only).
🔧 Fix:

• Quoted $username and $password variables in adduser calls.
• Used read -r to prevent backslash interpretation.
  ✅ Verification: Verified with a reproduction script that spaces in passwords are now preserved correctly.

---

PR created automatically by Jules for task 4389350057758254233 started by @bluPhy

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.

[coderabbitai]

Important

Review skipped

Bot user detected.

To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}