Make auth module optional to conditionnaly load auth providers (#518)

* Make auth module optional to conditionnaly load auth providers

* Fixes

server/src/integrations/environment/decorators/cast-to-boolean.decorator.ts

@@ -0,0 +1,18 @@
+import { Transform } from 'class-transformer';
+
+export function CastToBoolean() {
+  return Transform(({ value }: { value: string }) => toBoolean(value));
+}
+
+const toBoolean = (value: any) => {
+  if (typeof value === 'boolean') {
+    return value;
+  }
+  if (['true', 'on', 'yes', '1'].includes(value.toLowerCase())) {
+    return true;
+  }
+  if (['false', 'off', 'no', '0'].includes(value.toLowerCase())) {
+    return false;
+  }
+  return undefined;
+};