- added npm package dotenv-webpack for using env variables on clientside

- added API File Controller for downloading files e.g. /api/download/1022
- also create has codes by submitting new dataset
- added edit dataset functionalities for role submitter
- added the following route for role submitter: /dataset/:id/update', 'DatasetController.update'
- created extra UpdateDatasetValidator.ts for validating updated dataset
- npm updates

app/Models/HashValue.ts

@@ -3,7 +3,7 @@ import File from './File';
 
 export default class HashValue extends BaseModel {
     public static namingStrategy = new SnakeCaseNamingStrategy();
-    public static primaryKey = 'file_id, type';
+    // public static primaryKey = 'file_id,type';
     public static table = 'file_hashvalues';
 
     // static get primaryKey () {
@@ -20,10 +20,10 @@ export default class HashValue extends BaseModel {
     // public id: number;
 
     // Foreign key is still on the same model
-    @column({})
+    @column({ isPrimary: true })
     public file_id: number;
 
-    @column({})
+    @column({ isPrimary: true })
     public type: string;
 
     @column()