Fix: Make all env vars optional for Docker build time

drizzle.config.ts

@@ -6,6 +6,6 @@ export default {
   dialect: "postgresql",
   out: "./lib/db/migrations",
   dbCredentials: {
-    url: env.DATABASE_URL,
+    url: env.DATABASE_URL ?? "",
   }
 } satisfies Config;

lib/env.mjs

@@ -7,18 +7,10 @@ export const env = createEnv({
     NODE_ENV: z
       .enum(["development", "test", "production"])
       .default("development"),
-    DATABASE_URL: z.string().min(1),
+    DATABASE_URL: z.string().optional(),
     
-    NEXTAUTH_SECRET: process.env.NODE_ENV === "production"
-        ? z.string().min(1)
-        : z.string().optional(),
-    NEXTAUTH_URL: z.preprocess(
-      // This makes Vercel deployments not fail if you don't set NEXTAUTH_URL
-      // Since NextAuth.js automatically uses the VERCEL_URL if present.
-      (str) => process.env.VERCEL_URL ?? str,
-      // VERCEL_URL doesn't include `https` so it cant be validated as a URL
-      process.env.VERCEL_URL ? z.string().min(1) : z.string().url()
-    ),
+    NEXTAUTH_SECRET: z.string().optional(),
+    NEXTAUTH_URL: z.string().optional(),
     
     // Azure AD (Microsoft Entra ID) - optional in development
     AZURE_AD_CLIENT_ID: z.string().optional(),