Add passwordless sudo for the user

- Configure NOPASSWD: ALL for the created user
- Create proper sudoers.d file with correct permissions
- User no longer needs to enter password for sudo commands

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

post-install.sh

@@ -80,6 +80,11 @@ chmod 700 /home/${ALMA_USER}/.ssh
 chmod 600 /home/${ALMA_USER}/.ssh/authorized_keys
 chown -R ${ALMA_USER}:${ALMA_USER} /home/${ALMA_USER}/.ssh
 
+# Configure passwordless sudo
+echo "[+] Configuring passwordless sudo for ${ALMA_USER}..."
+echo "${ALMA_USER} ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/99-${ALMA_USER}
+chmod 440 /etc/sudoers.d/99-${ALMA_USER}
+
 # Install oh-my-zsh and powerlevel10k
 echo "[+] Installing oh-my-zsh and powerlevel10k..."
 # Download and run oh-my-zsh installer as the user with proper environment