Add persistent MySQL sql-mode configuration

[Copilot]

MySQL sql-mode settings were not persisting across service restarts, requiring manual configuration after each reboot.

Changes

• Create /etc/mysql/mysql.conf.d/bhima.cnf during installation with STRICT_ALL_TABLES and NO_UNSIGNED_SUBTRACTION modes
• Change systemctl start to systemctl restart to apply configuration immediately

# Add sql-mode to MySQL config so it persists across reboots
cat >/etc/mysql/mysql.conf.d/bhima.cnf <<EOF
[mysqld]
sql-mode='STRICT_ALL_TABLES,NO_UNSIGNED_SUBTRACTION'
EOF

systemctl restart mysql

The configuration now survives MySQL and system restarts without manual intervention.

Original prompt

Modify install/install.sh to configure a persistent sql-mode for MySQL.

In the install_mysql function:

1. Locate the section where the MySQL service is enabled and started (around line 105).
2. Before starting/restarting the service, create a configuration file at /etc/mysql/mysql.conf.d/bhima.cnf with the following content:

   [mysqld]
   sql-mode='STRICT_ALL_TABLES,NO_UNSIGNED_SUBTRACTION'

3. Ensure the MySQL service is restarted (systemctl restart mysql) so the configuration takes effect immediately.

The resulting code block in install_mysql should look similar to:

  # Start and enable MySQL
  systemctl enable mysql

  # Add sql-mode to MySQL config so it persists across reboots
  cat >/etc/mysql/mysql.conf.d/bhima.cnf <<EOF
[mysqld]
sql-mode='STRICT_ALL_TABLES,NO_UNSIGNED_SUBTRACTION'
EOF

  systemctl restart mysql

This pull request was created as a result of the following prompt from Copilot chat.

Modify install/install.sh to configure a persistent sql-mode for MySQL.

In the install_mysql function:

1. Locate the section where the MySQL service is enabled and started (around line 105).
2. Before starting/restarting the service, create a configuration file at /etc/mysql/mysql.conf.d/bhima.cnf with the following content:

   [mysqld]
   sql-mode='STRICT_ALL_TABLES,NO_UNSIGNED_SUBTRACTION'

3. Ensure the MySQL service is restarted (systemctl restart mysql) so the configuration takes effect immediately.

The resulting code block in install_mysql should look similar to:

  # Start and enable MySQL
  systemctl enable mysql

  # Add sql-mode to MySQL config so it persists across reboots
  cat >/etc/mysql/mysql.conf.d/bhima.cnf <<EOF
[mysqld]
sql-mode='STRICT_ALL_TABLES,NO_UNSIGNED_SUBTRACTION'
EOF

  systemctl restart mysql

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