Add the seed servers on the CI

Author: markharding

.gitlab/ci/build_app.yml

@@ -32,4 +32,5 @@ app-web-image:
         --frontend dockerfile.v0 \
         --local context=. \
         --local dockerfile=./apps/polycentric \
+        --opt build-arg:EXPO_PUBLIC_POLYCENTRIC_SEED_SERVERS=$EXPO_PUBLIC_POLYCENTRIC_SEED_SERVERS \
         --output type=image,name=$CI_REGISTRY_IMAGE/app:$CI_COMMIT_SHA,push=true

apps/polycentric/Dockerfile

@@ -8,6 +8,11 @@ RUN corepack enable && corepack prepare pnpm@10.19.0 --activate
 FROM base AS build
 WORKDIR /app
 
+# EXPO_PUBLIC_* env vars are inlined into the bundle at build time, so
+# they must be present during `expo export`. Passed in via build-arg.
+ARG EXPO_PUBLIC_POLYCENTRIC_SEED_SERVERS
+ENV EXPO_PUBLIC_POLYCENTRIC_SEED_SERVERS=$EXPO_PUBLIC_POLYCENTRIC_SEED_SERVERS
+
 COPY .npmrc turbo.jsonc pnpm-lock.yaml pnpm-workspace.yaml package.json ./
 COPY apps apps
 COPY packages packages