Add region param for MinIO bucket (#428)

add region parameter for MinIO buckets

app/server/lib/MinIOExternalStorage.ts

@@ -35,6 +35,7 @@ export class MinIOExternalStorage implements ExternalStorage {
     useSSL?: boolean,
     accessKey: string,
     secretKey: string,
+    region: string
   }, private _batchSize?: number) {
     this._s3 = new minio.Client(options) as MinIOClient;
   }

app/server/lib/configureMinIOExternalStorage.ts

@@ -19,6 +19,11 @@ export function checkMinIOExternalStorage() {
     preferredEnvVar: 'GRIST_DOCS_MINIO_BUCKET',
   });
   if (!bucket) { return undefined; }
+  const region = settings.flag('bucketRegion').requireString({
+    envVar: ['GRIST_DOCS_MINIO_BUCKET_REGION'],
+    preferredEnvVar: 'GRIST_DOCS_MINIO_BUCKET_REGION',
+    defaultValue: 'us-east-1'
+  });
   const prefix = settings.flag('prefix').requireString({
     envVar: ['GRIST_DOCS_MINIO_PREFIX'],
     preferredEnvVar: 'GRIST_DOCS_MINIO_PREFIX',
@@ -52,5 +57,6 @@ export function checkMinIOExternalStorage() {
     useSSL,
     accessKey,
     secretKey,
+    region
   };
 }