fix(environment): Make SSL variables optional (twentyhq#8843)

Previously, SSL_KEY_PATH and SSL_CERT_PATH were required if the
SERVER_URL started with 'https'. This change makes these variables
optional, allowing greater flexibility in dealing with SSL
configurations. This update helps in scenarios where SSL paths are
managed differently or not needed.

packages/twenty-server/src/engine/core-modules/environment/environment-variables.ts

@@ -473,11 +473,11 @@ export class EnvironmentVariables {
 
   // SSL
   @IsString()
-  @ValidateIf((env) => env.SERVER_URL.startsWith('https'))
+  @IsOptional()
   SSL_KEY_PATH: string;
 
   @IsString()
-  @ValidateIf((env) => env.SERVER_URL.startsWith('https'))
+  @IsOptional()
   SSL_CERT_PATH: string;
 }