add process signal processing

.editorconfig

@@ -11,3 +11,11 @@ trim_trailing_whitespace = true
 [{package.json,*.yml,*.yaml}]
 indent_style = space
 indent_size = 2
+
+[Dockerfile]
+indent_size = 2
+indent_style = tab
+
+[Makefile]
+indent_size = 2
+indent_style = tab

api/src/cli/commands/start.ts

@@ -1,4 +1,5 @@
 import logger from '../../logger';
+import { Express } from 'express';
 
 export default async function start() {
 	const { default: env } = require('../../env');
@@ -6,11 +7,24 @@ export default async function start() {
 
 	await validateDBConnection();
 
-	const app = require('../../app').default;
+	const app: Express = require('../../app').default;
 
 	const port = env.PORT;
 
-	app.listen(port, () => {
+	const server = app.listen(port, () => {
 		logger.info(`Server started at port ${port}`);
 	});
+
+	const signals: NodeJS.Signals[] = ['SIGHUP', 'SIGINT', 'SIGTERM'];
+	signals.forEach((signal) => {
+		process.on(signal, () =>
+			server.close((err) => {
+				if (err) {
+					logger.error(err.message, { err });
+					return;
+				}
+				logger.info('Server stopped.');
+			})
+		);
+	});
 }