api: add API_LISTEN_ADDRESS env for specifying bind address

src/core/api.js

@@ -194,7 +194,7 @@ export function runAPI(express, app, gitCommit, gitBranch, __dirname) {
         res.redirect('/api/json')
     });
 
-    app.listen(env.apiPort, () => {
+    app.listen(env.apiPort, env.listenAddress, () => {
         console.log(`\n` +
             `${Cyan("cobalt")} API ${Bright(`v.${version}-${gitCommit} (${gitBranch})`)}\n` +
             `Start time: ${Bright(`${startTime.toUTCString()} (${startTimestamp})`)}\n\n` +

src/modules/config.js

@@ -29,6 +29,7 @@ const
     apiEnvs = {
         apiPort: process.env.API_PORT || 9000,
         apiName: process.env.API_NAME || 'unknown',
+        listenAddress: process.env.API_LISTEN_ADDRESS,
         corsWildcard: process.env.CORS_WILDCARD !== '0',
         corsURL: process.env.CORS_URL,
         cookiePath: process.env.COOKIE_PATH,