ci: generate graphql schema in GH action

test/generateGraphQLSchema.ts

@@ -0,0 +1,19 @@
+import path from 'path';
+import fs from 'fs';
+import { generateGraphQLSchema } from '../src/bin/generateGraphQLSchema';
+
+const [testConfigDir] = process.argv.slice(2);
+
+const testDir = path.resolve(__dirname, testConfigDir);
+setPaths(testDir);
+generateGraphQLSchema();
+
+// Set config path and TS output path using test dir
+function setPaths(dir) {
+  const configPath = path.resolve(dir, 'config.ts');
+  if (fs.existsSync(configPath)) {
+    process.env.PAYLOAD_CONFIG_PATH = configPath;
+    return true;
+  }
+  return false;
+}