fix(core): update

ts/qenv.classes.qenv.ts

@@ -1,6 +1,8 @@
 import { ConfigVaultAdapter } from './qenv.classes.configvaultadapter.js';
 import * as plugins from './qenv.plugins.js';
 
+export type TEnvVarRef = string | (() => Promise<string>);
+
 export class Qenv {
   public requiredEnvVars: string[] = [];
   public availableEnvVars: string[] = [];
@@ -75,7 +77,7 @@ export class Qenv {
   }
 
   public async getEnvVarOnDemand(
-    envVarNameOrNames: string | string[]
+    envVarNameOrNames: TEnvVarRef | TEnvVarRef[]
   ): Promise<string | undefined> {
     if (Array.isArray(envVarNameOrNames)) {
       for (const envVarName of envVarNameOrNames) {
@@ -115,12 +117,16 @@ export class Qenv {
     return rawValue;
   }
 
-  private async tryGetEnvVar(envVarName: string): Promise<string | undefined> {
+  private async tryGetEnvVar(envVarRefArg: TEnvVarRef): Promise<string | undefined> {
+    if (typeof envVarRefArg === 'function') {
+      return await envVarRefArg();
+    }
+
     return (
-      this.getFromEnvironmentVariable(envVarName) ||
-      this.getFromEnvJsonFile(envVarName) ||
-      this.getFromDockerSecret(envVarName) ||
-      this.getFromDockerSecretJson(envVarName)
+      this.getFromEnvironmentVariable(envVarRefArg) ||
+      this.getFromEnvJsonFile(envVarRefArg) ||
+      this.getFromDockerSecret(envVarRefArg) ||
+      this.getFromDockerSecretJson(envVarRefArg)
     );
   }