Added isKnownEnv

src/utils/isKnownEnv.ts

@@ -0,0 +1,8 @@
+import { knownEnvs } from '../config/schemas';
+import type { KnownEnv, } from '../types';
+
+const isKnownEnv = (env: string): env is KnownEnv => {
+  return knownEnvs.some((knownEnv) => knownEnv === env);
+}
+
+export default isKnownEnv;