feat(portal-self-service): runtime config + nginx serve/proxy image (refs #68)

The app loads /config.json at startup (main.ts) so the OIDC authority is set per
environment from one build; appConfig becomes a factory and derives redirectUrl +
secureApiOrigin from the app origin (same-origin as the BFF). A multi-stage
Dockerfile builds the app and serves it via nginx, reverse-proxying /self-service
+ /openbaar to the bff (relative URLs → no CORS); nginx resolves the BFF at request
time. The compose image bakes config.json with the keycloak:8080 authority so the
browser's token issuer matches the BFF (ADR-0010).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/self-service/Dockerfile

@@ -0,0 +1,23 @@
+# Multi-stage build for the self-service portal (Angular → nginx).
+# Build context is the repo root (the app needs the pnpm workspace + libs). See infra/docker-compose.yml.
+FROM node:24-slim AS build
+WORKDIR /src
+RUN corepack enable && corepack prepare pnpm@11.5.2 --activate
+
+# Restore first (cached unless the manifests change).
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml nx.json tsconfig.base.json eslint.config.mjs ./
+RUN pnpm install --frozen-lockfile
+
+# Sources (only what the app + its libs need).
+COPY apps/self-service apps/self-service
+COPY libs libs
+RUN pnpm nx build self-service
+
+FROM nginx:1.27-alpine AS runtime
+COPY apps/self-service/nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /src/dist/apps/self-service/browser /usr/share/nginx/html
+# Compose-time OIDC config: the browser (Playwright, on the compose network) reaches Keycloak by
+# service name, so the token issuer matches the BFF's authority (host-consistent, ADR-0010).
+RUN printf '{ "authority": "http://keycloak:8080/realms/digid" }\n' > /usr/share/nginx/html/config.json
+
+EXPOSE 80

apps/self-service/nginx.conf

@@ -0,0 +1,29 @@
+server {
+  listen 80;
+  server_name _;
+  root /usr/share/nginx/html;
+  index index.html;
+
+  # Resolve the BFF via Docker's embedded DNS at request time (variable proxy_pass), so nginx starts
+  # even before the BFF is up and picks up restarts — instead of failing to load the config.
+  resolver 127.0.0.11 ipv6=off valid=30s;
+
+  # Same-origin API: proxy the BFF endpoint groups to the bff service. The api-client uses relative
+  # URLs, so the browser calls this origin and nginx forwards to the BFF — no CORS, and the DigiD
+  # token (same-origin) is attached by the app's interceptor (S-08d/ADR-0010).
+  location /self-service/ {
+    set $bff http://bff:8080;
+    proxy_pass $bff;
+    proxy_set_header Host $host;
+  }
+  location /openbaar/ {
+    set $bff http://bff:8080;
+    proxy_pass $bff;
+    proxy_set_header Host $host;
+  }
+
+  # SPA fallback — Angular client-side routing.
+  location / {
+    try_files $uri $uri/ /index.html;
+  }
+}

apps/self-service/public/config.json

@@ -0,0 +1,3 @@
+{
+  "authority": "http://localhost:8180/realms/digid"
+}

apps/self-service/src/app/app.config.ts

@@ -7,16 +7,29 @@ import { provideRouter } from '@angular/router';
 import { authInterceptor, provideDigiadAuth } from 'auth';
 import { appRoutes } from './app.routes';
 
-export const appConfig: ApplicationConfig = {
+/** Environment-specific settings fetched from /config.json at startup (see main.ts). */
+export interface RuntimeConfig {
+  /** The Keycloak `digid` realm issuer as the browser reaches it (dev: localhost; compose: keycloak:8080). */
+  authority: string;
+}
+
+/**
+ * Build the app providers from runtime config. `redirectUrl` and `secureApiOrigin` are the app's own
+ * origin: the app is served same-origin as the BFF (nginx proxies /self-service + /openbaar), so the
+ * api-client's relative calls stay same-origin and the token interceptor attaches to them.
+ */
+export function appConfig(runtime: RuntimeConfig): ApplicationConfig {
+  const origin = typeof window !== 'undefined' ? window.location.origin : '/';
+  return {
     providers: [
       provideBrowserGlobalErrorListeners(),
       provideRouter(appRoutes),
       provideHttpClient(withInterceptors([authInterceptor()])),
-    // Dev defaults (host ports). The compose-served app overrides these for the stack (S-08d).
       provideDigiadAuth({
-      authority: 'http://localhost:8180/realms/digid',
+        authority: runtime.authority,
-      redirectUrl: typeof window !== 'undefined' ? window.location.origin : '/',
+        redirectUrl: origin,
-      secureApiOrigin: 'http://localhost:8080',
+        secureApiOrigin: origin,
       }),
     ],
   };
+}

apps/self-service/src/main.ts

@@ -1,5 +1,10 @@
 import { bootstrapApplication } from '@angular/platform-browser';
-import { appConfig } from './app/app.config';
 import { App } from './app/app';
+import { appConfig, type RuntimeConfig } from './app/app.config';
 
-bootstrapApplication(App, appConfig).catch((err) => console.error(err));
+// Load environment config before bootstrap so the OIDC authority is set per environment
+// (dev: localhost; compose: keycloak:8080) from a single build — 12-factor (S-08d).
+fetch('config.json')
+  .then((response) => response.json() as Promise<RuntimeConfig>)
+  .then((config) => bootstrapApplication(App, appConfig(config)))
+  .catch((err) => console.error(err));