feat: fix vite url using env var

frontend/Dockerfile

@@ -4,6 +4,10 @@ WORKDIR /app
 COPY package*.json ./
 RUN npm install
 COPY . .
+
+ARG VITE_API_URL
+ENV VITE_API_URL=$VITE_API_URL
+
 RUN npm run build
 
 # Production stage

frontend/src/utils/BlogList.tsx

@@ -1,9 +1,10 @@
 import { useState, useEffect } from "react";
+import { API_URL } from "./constants";
 
 export function BlogList() {
   const [content, setContent] = useState("");
   useEffect(() => {
-    fetch(`localhost:8000/get-blogs`)
+    fetch(`${API_URL}/get-blogs`)
       .then((res) => res.text())
       .then(setContent);
   }, []);