fix: Generate swagger host and scheme

genarated swagger scheme and host based on `NC_PUBLIC_URL` environment variable

fixes #288

Signed-off-by: Pranav C Balan <pranavxc@gmail.com>

packages/nocodb/src/lib/noco/rest/RestApiBuilder.ts

@@ -1508,9 +1508,13 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
       let swaggerBaseDocument: any = JSON.parse(JSON.stringify(await import('./ui/auth/swagger-base.xc.json')));
 
       if (this.config?.auth?.jwt?.dbAlias !== this.connectionConfig.meta.dbAlias) {
-        swaggerBaseDocument = {...swaggerBaseDocument, tags: [], definitions: {}, paths: {}, host: req.get('host')};
+        swaggerBaseDocument = {...swaggerBaseDocument, tags: [], definitions: {}, paths: {}};
       }
       
+      const host = process.env.NC_PUBLIC_URL ? new URL(process.env.NC_PUBLIC_URL)?.host : req.get('host');
+      const scheme = process.env.NC_PUBLIC_URL ? new URL(process.env.NC_PUBLIC_URL)?.protocol.slice(0, -1) : req.protocol;
+      swaggerBaseDocument.host = host;
+      swaggerBaseDocument.schemes = [scheme];
       glob.sync(path.join(this.config.toolDir, 'nc', this.projectId, this.getDbAlias(), 'swagger', 'swagger.json')).forEach(jsonFile => {
         const swaggerJson = JSON.parse(fs.readFileSync(jsonFile, 'utf8'));
         swaggerBaseDocument.tags.push(...swaggerJson.tags);