chore: load env file in dev

Author: mrlubos

dev/.env.example

@@ -0,0 +1,2 @@
+PRESET=tanstack
+INPUT=full

dev/openapi-python.config.ts

@@ -1,3 +1,5 @@
+import 'dotenv/config';
+
 import path from 'node:path';
 
 import { defineConfig } from '@hey-api/openapi-python';

dev/openapi-ts.config.ts

@@ -1,3 +1,5 @@
+import 'dotenv/config';
+
 import path from 'node:path';
 
 import { defineConfig } from '@hey-api/openapi-ts';