Feature/tighten validation rule of base currency (#1428)

* Tighten validation rule of BASE_CURRENCY

* Update changelog

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Changed
+
+- Tightened the validation rule of the base currency environment variable (`BASE_CURRENCY`)
+
 ## 1.209.0 - 05.11.2022
 
 ### Added

README.md

@@ -84,9 +84,9 @@ We provide official container images hosted on [Docker Hub](https://hub.docker.c
 ### Supported Environment Variables
 
 | Name                | Default Value | Description                                                                                                                                                                                                                                      |
-| ------------------- | ------------- | ----------------------------------------------------------------------------------------------------------------------------------- |
+| ------------------- | ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
 | `ACCESS_TOKEN_SALT` |               | A random string used as salt for access tokens                                                                                                                                                                                                   |
-| `BASE_CURRENCY`     | `USD`         | The base currency of the Ghostfolio application. Caution: This cannot be changed later!                                             |
+| `BASE_CURRENCY`     | `USD`         | The base currency of the Ghostfolio application.<br />`AUD` \| `CAD` \| `CNY` \| `EUR` \| `GBP` \| `JPY` \| `RUB` \| `USD`<br />Caution: Only set if you intend to track cryptocurrencies in a non-`USD` currency. This cannot be changed later! |
 | `DATABASE_URL`      |               | The database connection URL, e.g. `postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@localhost:5432/${POSTGRES_DB}?sslmode=prefer`                                                                                                              |
 | `HOST`              | `0.0.0.0`     | The host where the Ghostfolio application will run on                                                                                                                                                                                            |
 | `JWT_SECRET_KEY`    |               | A random string used for _JSON Web Tokens_ (JWT)                                                                                                                                                                                                 |

apps/api/src/services/configuration.service.ts

@@ -12,7 +12,10 @@ export class ConfigurationService {
     this.environmentConfiguration = cleanEnv(process.env, {
       ACCESS_TOKEN_SALT: str(),
       ALPHA_VANTAGE_API_KEY: str({ default: '' }),
-      BASE_CURRENCY: str({ default: 'USD' }),
+      BASE_CURRENCY: str({
+        choices: ['AUD', 'CAD', 'CNY', 'EUR', 'GBP', 'JPY', 'RUB', 'USD'],
+        default: 'USD'
+      }),
       CACHE_TTL: num({ default: 1 }),
       DATA_SOURCE_PRIMARY: str({ default: DataSource.YAHOO }),
       DATA_SOURCES: json({