Add mechanism for NPM package auto-discovery

src/lifecycle/Application.ts

@@ -48,6 +48,12 @@ export function appPath(...parts: PathLike[]): UniversalPath {
  * The main application container.
  */
 export class Application extends Container {
+    public static readonly NODE_MODULES_INJECTION = 'extollo/npm'
+
+    public static get NODE_MODULES_PROVIDER(): string {
+        return process.env.EXTOLLO_NPM || 'pnpm'
+    }
+
     public static getContainer(): Container {
         const existing = <Container | undefined> globalRegistry.getGlobal('extollo/injector')
         if ( !existing ) {
@@ -205,6 +211,7 @@ export class Application extends Container {
         this.setupLogging()
 
         this.registerFactory(new CacheFactory())  // FIXME move this somewhere else?
+        this.registerSingleton(Application.NODE_MODULES_INJECTION, Application.NODE_MODULES_PROVIDER)
 
         this.make<Logging>(Logging).debug(`Application root: ${this.baseDir}`)
     }