Add env vars to kubernetes config for production (#53620)

Dockerfile

@@ -140,20 +140,14 @@ COPY --chown=node:node --from=builder $APP_HOME/next.config.js ./
 COPY --chown=node:node --from=builder $APP_HOME/tsconfig.json ./
 
 # - - -
-# Environment variables
+# Environment variables are set in the Moda 
+# configuration: config/moda/configuration/*/env.yaml
 # - - -
+
 # This makes it possible to set `--build-arg BUILD_SHA=abc123`
 # and it then becomes available as an environment variable in the docker run.
 ARG BUILD_SHA
 ENV BUILD_SHA=$BUILD_SHA
-# We should always be running in production mode
-ENV NODE_ENV=production
-# Preferred port for server.js
-ENV PORT=4000
-# Include all languages
-ENV ENABLED_LANGUAGES="en,zh,es,pt,ru,ja,fr,de,ko"
-
-EXPOSE $PORT
 
 # Entrypoint to start the server
 # Note: Currently we have to use tsx because we have a mix of `.ts` and `.js` files with multiple import patterns

config/kubernetes/production/deployments/webapp.yaml

@@ -37,6 +37,10 @@ spec:
                 name: vault-secrets
             - configMapRef:
                 name: kube-cluster-metadata
+            # application-config is crated at deploy time from
+            # configuration set in config/moda/configuration/*/env.yaml
+            - configMapRef:
+                name: application-config
           # Zero-downtime deploys
           # https://thehub.github.com/engineering/products-and-services/internal/moda/feature-documentation/pod-lifecycle/#required-prestop-hook
           # https://kubernetes.io/docs/concepts/containers/container-lifecycle-hooks/#container-hooks

config/moda/configuration/production/env.yaml

@@ -0,0 +1,8 @@
+data:
+  NODE_ENV: production
+  NODE_OPTIONS: '--max-old-space-size=4096'
+  PORT: '4000'
+  ENABLED_LANGUAGES: 'en,zh,es,pt,ru,ja,fr,de,ko'
+  HEROKU_APP_NAME: help-docs
+  HEROKU_PRODUCTION_APP: 'true'
+  RATE_LIMIT_MAX: '21'