fix wrong env name

src/app/contact/action.ts

@@ -6,7 +6,7 @@ export async function getReCaptchaSiteKey() {
   return process.env.RECAPTCHA_SITE_KEY;
 }
 
-const RECAPTCHA_SECRET_KEY = process.env.RECAPTCHA_SECRET_KEY;
+const RECAPTCHA_SERVER_KEY = process.env.RECAPTCHA_SERVER_KEY;
 
 export type SubmitContactReturn = { error: string } | { success: true };
 
@@ -14,9 +14,9 @@ export default async function SubmitContact(
   prevState: unknown,
   data: FormData
 ): Promise<SubmitContactReturn> {
-  if (!RECAPTCHA_SECRET_KEY) {
+  if (!RECAPTCHA_SERVER_KEY) {
     console.error(
-      "RECAPTCHA_SECRET_KEY is not set. Please check your environment variables."
+      "RECAPTCHA_SERVER_KEY is not set. Please check your environment variables."
     );
     throw new Error("Server error: RECAPTCHA not configure correctly.");
   }
@@ -42,7 +42,7 @@ export default async function SubmitContact(
         headers: {
           "Content-Type": "application/x-www-form-urlencoded",
         },
-        body: `secret=${RECAPTCHA_SECRET_KEY}&response=${recaptcha}`,
+        body: `secret=${RECAPTCHA_SERVER_KEY}&response=${recaptcha}`,
       }
     );
     const recaptchaData = await recaptchaResponse.json();