Make twenty-front build env agnostic (#20055)

## Introduction
In aim to reduce and optimize the number of twenty-front build we do
during our cd process and allow twenty-front build promotion

### Build time

**Nothing is baked.** The `build/` directory is a clean, env-agnostic
artifact. `index.html` contains the empty placeholder:

```html
<script id="twenty-env-config">
  window._env_ = {
    // This will be overwritten
  };
</script>
```

The JS bundles contain no hardcoded server URL.

---

### Deploy mode 1: Frontend served by the backend (Docker / NestJS)

1. Container starts, NestJS boots in `main.ts`
2. `generateFrontConfig()` runs, reads `process.env.SERVER_URL`
3. Rewrites `dist/front/index.html`, replacing the placeholder with:
   ```html
   <script id="twenty-env-config">
     window._env_ = {
       REACT_APP_SERVER_BASE_URL: "https://api.example.com"
     };
   </script>
   ```
4. NestJS serves the static `dist/front/` directory
5. Browser loads `index.html`, `window._env_` is set before the app JS
executes
6. `src/config/index.ts` reads `window._env_.REACT_APP_SERVER_BASE_URL`
and uses it

---

### Deploy mode 2: Frontend served standalone (CDN / nginx / static
server)

1. Take the `build/` artifact as-is
2. Before serving, run at deploy time:
   ```bash
REACT_APP_SERVER_BASE_URL=https://api.example.com sh
./scripts/inject-runtime-env.sh
   ```
3. This does the same `sed` replacement on `build/index.html`
4. Serve the `build/` directory with your static server of choice
5. Same resolution in the browser:
`window._env_.REACT_APP_SERVER_BASE_URL` is picked up by
`src/config/index.ts`

---

### Fallback: no injection at all

If neither mechanism runs (e.g. local dev with `vite dev`),
`window._env_.REACT_APP_SERVER_BASE_URL` is `undefined`, and
`getDefaultUrl()` kicks in:
- **Localhost**: returns `http://localhost:3000`
- **Non-localhost**: returns same-origin (`window.location.origin`)

packages/twenty-docker/twenty/Dockerfile

@@ -49,8 +49,6 @@ RUN yarn workspaces focus --production twenty-emails twenty-shared twenty-sdk tw
 
 FROM common-deps AS twenty-front-build
 
-ARG REACT_APP_SERVER_BASE_URL
-
 COPY ./packages/twenty-front /app/packages/twenty-front
 COPY ./packages/twenty-front-component-renderer /app/packages/twenty-front-component-renderer
 COPY ./packages/twenty-ui /app/packages/twenty-ui
@@ -138,9 +136,6 @@ USER 1000
 
 FROM twenty-server AS twenty
 
-ARG REACT_APP_SERVER_BASE_URL
-ENV REACT_APP_SERVER_BASE_URL=$REACT_APP_SERVER_BASE_URL
-
 COPY --chown=1000 --from=twenty-front-build /app/packages/twenty-front/build /app/packages/twenty-server/dist/front
 
 LABEL org.opencontainers.image.description="Twenty image with backend and frontend."
@@ -232,7 +227,6 @@ RUN mkdir -p /data/postgres /data/redis /app/packages/twenty-server/.local-stora
  && chown -R postgres:postgres /data/postgres \
  && chown 1000:1000 /data/redis /app/packages/twenty-server/.local-storage
 
-ARG REACT_APP_SERVER_BASE_URL
 ARG APP_VERSION=0.0.0
 
 ENV S6_KEEP_ENV=1
@@ -241,7 +235,6 @@ ENV PG_DATABASE_URL=postgres://twenty:twenty@localhost:5432/default \
     REDIS_URL=redis://localhost:6379 \
     STORAGE_TYPE=local \
     APP_SECRET=twenty-app-dev-secret-not-for-production \
-    REACT_APP_SERVER_BASE_URL=$REACT_APP_SERVER_BASE_URL \
     APP_VERSION=$APP_VERSION \
     NODE_ENV=development \
     NODE_PORT=2020 \

packages/twenty-front/package.json

@@ -3,8 +3,8 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "build": "NODE_ENV=production NODE_OPTIONS=--max-old-space-size=8192 npx vite build && sh ./scripts/inject-runtime-env.sh",
-    "build:sourcemaps": "NODE_ENV=production VITE_BUILD_SOURCEMAP=true NODE_OPTIONS=--max-old-space-size=8192 npx vite build && sh ./scripts/inject-runtime-env.sh",
+    "build": "NODE_ENV=production NODE_OPTIONS=--max-old-space-size=8192 npx vite build",
+    "build:sourcemaps": "NODE_ENV=production VITE_BUILD_SOURCEMAP=true NODE_OPTIONS=--max-old-space-size=8192 npx vite build",
     "start:prod": "NODE_ENV=production npx serve -s build",
     "tsup": "npx tsup"
   },

packages/twenty-front/scripts/inject-runtime-env.sh

@@ -1,5 +1,10 @@
 #!/bin/sh
 
+if [ -z "$REACT_APP_SERVER_BASE_URL" ]; then
+  echo "Error: REACT_APP_SERVER_BASE_URL is not set."
+  exit 1
+fi
+
 echo "Injecting runtime environment variables into index.html..."
 
 CONFIG_BLOCK=$(cat << EOF

packages/twenty-front/src/config/index.ts

@@ -18,6 +18,4 @@ const getDefaultUrl = () => {
 };
 
 export const REACT_APP_SERVER_BASE_URL =
-  window._env_?.REACT_APP_SERVER_BASE_URL ||
-  process.env.REACT_APP_SERVER_BASE_URL ||
-  getDefaultUrl();
+  window._env_?.REACT_APP_SERVER_BASE_URL || getDefaultUrl();

packages/twenty-front/src/testing/mockedApolloClient.ts

@@ -1,8 +1,10 @@
 import { ApolloClient, HttpLink, InMemoryCache } from '@apollo/client';
 
+import { REACT_APP_SERVER_BASE_URL } from '~/config';
+
 export const mockedApolloClient = new ApolloClient({
   link: new HttpLink({
-    uri: process.env.REACT_APP_SERVER_BASE_URL + '/metadata',
+    uri: REACT_APP_SERVER_BASE_URL + '/metadata',
   }),
   cache: new InMemoryCache(),
 });

packages/twenty-front/src/testing/mockedApolloCoreClient.ts

@@ -1,8 +1,10 @@
 import { ApolloClient, HttpLink, InMemoryCache } from '@apollo/client';
 
+import { REACT_APP_SERVER_BASE_URL } from '~/config';
+
 export const mockedApolloCoreClient = new ApolloClient({
   link: new HttpLink({
-    uri: process.env.REACT_APP_SERVER_BASE_URL + '/graphql',
+    uri: REACT_APP_SERVER_BASE_URL + '/graphql',
   }),
   cache: new InMemoryCache(),
 });

packages/twenty-front/vite.config.ts

@@ -20,7 +20,6 @@ export default defineConfig(({ mode }) => {
   const env = loadEnv(mode, __dirname, '');
 
   const {
-    REACT_APP_SERVER_BASE_URL,
     VITE_BUILD_SOURCEMAP,
     VITE_HOST,
     SSL_CERT_PATH,
@@ -232,11 +231,7 @@ export default defineConfig(({ mode }) => {
     envPrefix: 'REACT_APP_',
 
     define: {
-      _env_: {
-        REACT_APP_SERVER_BASE_URL,
-      },
       'process.env': {
-        REACT_APP_SERVER_BASE_URL,
         IS_DEBUG_MODE,
         IS_DEV_ENV: mode === 'development' ? 'true' : 'false',
       },