Finally got this repo set up nice I think

apps/next/src/env.ts

@@ -0,0 +1,48 @@
+import { createEnv } from "@t3-oss/env-nextjs";
+import { z } from "zod/v4";
+
+export const env = createEnv({
+  shared: {
+    NODE_ENV: z
+      .enum(["development", "production", "test"])
+      .default("development"),
+    CI: z.boolean().default(false),
+    SITE_URL: z.string().default("http://localhost:3000"),
+  },
+  /**
+   * Specify your server-side environment variables schema here.
+   * This way you can ensure the app isn't built with invalid env vars.
+   */
+  server: {
+    SENTRY_AUTH_TOKEN: z.string(),
+  },
+
+  /**
+   * Specify your client-side environment variables schema here.
+   * For them to be exposed to the client, prefix them with `NEXT_PUBLIC_`.
+   */
+  client: {
+    NEXT_PUBLIC_CONVEX_URL: z.url(),
+    NEXT_PUBLIC_PLAUSIBLE_URL: z.url(),
+    NEXT_PUBLIC_SENTRY_DSN: z.string(),
+    NEXT_PUBLIC_SENTRY_URL: z.string(),
+    NEXT_PUBLIC_SENTRY_ORG: z.string(),
+    NEXT_PUBLIC_SENTRY_PROJECT_NAME: z.string(),
+  },
+  /**
+   * Destructure all variables from `process.env` to make sure they aren't tree-shaken away.
+   */
+  experimental__runtimeEnv: {
+    NODE_ENV: process.env.NODE_ENV,
+    CI: process.env.CI,
+    SITE_URL: process.env.SITE_URL,
+    NEXT_PUBLIC_CONVEX_URL: process.env.NEXT_PUBLIC_CONVEX_URL,
+    NEXT_PUBLIC_PLAUSIBLE_URL: process.env.NEXT_PUBLIC_PLAUSIBLE_URL,
+    NEXT_PUBLIC_SENTRY_DSN: process.env.NEXT_PUBLIC_SENTRY_DSN,
+    NEXT_PUBLIC_SENTRY_URL: process.env.NEXT_PUBLIC_SENTRY_URL,
+    NEXT_PUBLIC_SENTRY_ORG: process.env.NEXT_PUBLIC_SENTRY_ORG,
+    NEXT_PUBLIC_SENTRY_PROJECT_NAME: process.env.NEXT_PUBLIC_SENTRY_PROJECT_NAME,
+  },
+  skipValidation:
+    !!process.env.CI || process.env.npm_lifecycle_event === "lint",
+});