Allow specifying database client certificates via environment variables

[Jauchi]

Desired Behavior

Client side certificates enhance security by requiring mutual authentication for databases.

Support is already baked into netbox, there are just no environment variables to expose the functionality.

Contrast to Current Behavior

Currently, database configuration needs to be done in the extra.py config file.

Required Changes

Replace

netbox-docker/configuration/configuration.py

Lines 67 to 80 in b47e85a

	DATABASE = {
	'NAME': environ.get('DB_NAME', 'netbox'), # Database name
	'USER': environ.get('DB_USER', ''), # PostgreSQL username
	'PASSWORD': _read_secret('db_password', environ.get('DB_PASSWORD', '')),
	# PostgreSQL password
	'HOST': environ.get('DB_HOST', 'localhost'), # Database server
	'PORT': environ.get('DB_PORT', ''), # Database port (leave blank for default)
	'OPTIONS': {'sslmode': environ.get('DB_SSLMODE', 'prefer')},
	# Database connection SSLMODE
	'CONN_MAX_AGE': _environ_get_and_map('DB_CONN_MAX_AGE', '300', _AS_INT),
	# Max database connection age
	'DISABLE_SERVER_SIDE_CURSORS': _environ_get_and_map('DB_DISABLE_SERVER_SIDE_CURSORS', 'False', _AS_BOOL),
	# Disable the use of server-side cursors transaction pooling
	}

with

    DATABASE = {
        'NAME': environ.get('DB_NAME', 'netbox'),       # Database name
        'USER': environ.get('DB_USER', ''),             # PostgreSQL username
        'PASSWORD': environ.get('DB_PASSWORD', ''), # password
        'HOST': environ.get('DB_HOST', 'localhost'),    # Database server
        'PORT': environ.get('DB_PORT', ''),             # Database port (leave blank for default)
        'OPTIONS': {
          'sslmode': environ.get('DB_SSLMODE', 'prefer'), # Database connection SSLMODE
          'sslcert': environ.get('DB_CLIENT_SSL_CERT', None),
          'sslkey':  environ.get('DB_CLIENT_SSL_KEY',  None),
          'sslrootcert': environ.get('DB_CLIENT_SSL_CA', None)
        },
        'CONN_MAX_AGE': environ.get('DB_CONN_MAX_AGE', 300), # Max database connection age
        'DISABLE_SERVER_SIDE_CURSORS': environ.get('DB_DISABLE_SERVER_SIDE_CURSORS', False)
    }

(added sslcert, sslkey, sslrootcert parameters)

Discussion: Benefits and Drawbacks

No response