client: replace submodule with specific release

.gitmodules

@@ -1,6 +1,3 @@
 [submodule "server"]
 	path = server
 	url = https://github.com/getodk/central-backend.git
-[submodule "client"]
-	path = client
-	url = https://github.com/getodk/central-frontend.git

docker-compose.yml

@@ -95,6 +95,9 @@ services:
     build:
       context: .
       dockerfile: nginx.dockerfile
+      args:
+        FRONTEND_REPO: alxndrsn/odk-central-frontend
+        FRONTEND_VERSION: v0.0.0-oidjfroifgjroijgfoijdg
     depends_on:
       - service
       - enketo

files/prebuild/build-frontend.sh

@@ -2,8 +2,6 @@
 set -o pipefail
 shopt -s inherit_errexit
 
-cd client
-
 if [[ ${SKIP_FRONTEND_BUILD-} != "" ]]; then
   echo "[build-frontend] Skipping frontend build."
 
@@ -42,6 +40,6 @@ if [[ ${SKIP_FRONTEND_BUILD-} != "" ]]; then
 
   exit
 else
-  npm clean-install --no-audit --fund=false --update-notifier=false
-  NODE_OPTIONS="--max-old-space-size=2048" npm run build
+  curl --location "https://github.com/$FRONTEND_REPO/releases/download/$FRONTEND_VERSION/dist-$FRONTEND_VERSION.tar.gz" -o dist.tar.gz
+  tar --extract --file dist.tar.gz
 fi

nginx.dockerfile

@@ -2,13 +2,17 @@ FROM node:24.14.1-slim AS intermediate
 
 RUN apt-get update \
     && apt-get install -y --no-install-recommends \
+        ca-certificates \
+        curl \
         git \
     && rm -rf /var/lib/apt/lists/*
 
 COPY ./ ./
 RUN files/prebuild/write-version.sh
 
 ARG SKIP_FRONTEND_BUILD
+ARG FRONTEND_REPO=getodk/frontend
+ARG FRONTEND_VERSION
 RUN files/prebuild/build-frontend.sh
 
 
@@ -39,7 +43,7 @@ COPY files/nginx/setup-odk.sh \
 COPY files/nginx/redirector.conf /usr/share/odk/nginx/
 COPY files/nginx/common-headers.conf /usr/share/odk/nginx/
 COPY files/nginx/robots.txt /usr/share/nginx/html
-COPY --from=intermediate client/dist/ /usr/share/nginx/html
+COPY --from=intermediate dist/ /usr/share/nginx/html
 COPY --from=intermediate /tmp/version.txt /usr/share/nginx/html
 
 ENTRYPOINT [ "/scripts/setup-odk.sh" ]