fix dockerfile, add signup validation

frontend/Dockerfile

@@ -1,10 +1,11 @@
-FROM node:20-alpine AS build
+FROM node:20 AS build
 WORKDIR /app
+RUN apt-get update && apt-get install -y build-essential libcairo2-dev libpango1.0-dev libjpeg-dev libgif-dev librsvg2-dev
 
 # cache package installs
 COPY .yarnrc.yml yarn.lock package.json /app/
 RUN corepack enable
-RUN yarn install
+RUN yarn install --immutable
 
 COPY . /app
 RUN yarn build

frontend/src/routes/signup.test.tsx

@@ -54,7 +54,7 @@ test("signup calls service", async () => {
   fireEvent.change(emailField, { target: { value: "[email protected]" } });
 
   const passwordField = screen.getByLabelText("Password");
-  fireEvent.change(passwordField, { target: { value: "password" } });
+  fireEvent.change(passwordField, { target: { value: "Password123" } });
 
   const countryField = screen.getByPlaceholderText("TR");
   fireEvent.change(countryField, { target: { value: "TR" } });
@@ -73,7 +73,7 @@ test("signup calls service", async () => {
       body: {
         username: "john_doe",
         email: "[email protected]",
-        password: "password",
+        password: "Password123",
         firstName: "John",
         lastName: "Doe",
         country: "TR",

frontend/src/routes/signup.tsx

@@ -40,7 +40,23 @@ const signupSchema = z.object({
   lastName: z.string().min(1),
   username: z.string().min(1),
   email: z.string().email(),
-  password: z.string().min(8),
+  password: z
+    .string()
+    .min(8)
+    .refine(
+      (password) => {
+        return (
+          password.length >= 8 &&
+          /[A-Z]/.test(password) &&
+          /[a-z]/.test(password) &&
+          /[0-9]/.test(password)
+        );
+      },
+      {
+        message:
+          "Password must contain at least 8 characters, one uppercase letter, one lowercase letter, and one number",
+      },
+    ),
   country: z.string().min(1),
   redirectTo: z.string().optional(),
   experienceLevel: z.enum(["BEGINNER", "INTERMEDIATE", "ADVANCED"]),