use requested path to configs (#357)

Author: jesopo

src/config.ts

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 import * as fs from "fs";
+import * as path from "path";
 import { load } from "js-yaml";
 import { MatrixClient } from "matrix-bot-sdk";
 
@@ -170,7 +171,10 @@ const defaultConfig: IConfig = {
 };
 
 export function read(): IConfig {
-    const content = fs.readFileSync(`./config/${process.env.NODE_ENV || 'default'}.yaml`, "utf8");
+    const config_dir = process.env.NODE_CONFIG_DIR || "./config";
+    const config_file = `${process.env.NODE_ENV || "default"}.yaml`
+
+    const content = fs.readFileSync(path.join(config_dir, config_file), "utf8");
     const parsed = load(content);
     const config = {...defaultConfig, ...(parsed as object)} as IConfig;
     return config;