🛡️ Sentinel: Fix shell variable quoting issues in entrypoint

[google-labs-jules]

🛡️ Sentinel Security Fix

Vulnerability: Input handling flaw in copyables/entrypoint.sh
Severity: MEDIUM

What was found:

1. Variables $username and $password were used unquoted in adduser calls. This causes passwords with spaces (e.g., "secret pass") to be split into multiple arguments, resulting in only the first part ("secret") being set as the password.
2. Variables $CERT and $KEY were used unquoted in echo commands. If these variables contained * or other glob characters, the shell would expand them to file listings, potentially leaking file existence or causing unexpected behavior.

The Fix:

• Added double quotes around $username, $password, $CERT, and $KEY variables to ensure they are treated as literal strings.

Verification:

• Verified via reproduction scripts that unquoted variables cause splitting/expansion and quoted variables behave correctly.
• Checked script syntax with bash -n.

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PR created automatically by Jules for task 17784029209023714010 started by @bluPhy

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