From c52dcda03b525704187093612248dcf92c52af96 Mon Sep 17 00:00:00 2001
From: Nicholas Ceballos <nceballos@acsyt.com>
Date: Mon, 1 Jun 2026 17:11:18 -0600
Subject: [PATCH] feat(docker): add env var substitution for nginx config at
 runtime

install gettext package via apk to get envsubst tool
update docker-entrypoint.sh to export APP_ENV and APP_VERSION, then substitute these variables into the nginx configuration file before executing the main command
---
 Dockerfile           | 2 +-
 docker-entrypoint.sh | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Dockerfile b/Dockerfile
index 4bd1ee4..89e3145 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,7 +17,7 @@ LABEL org.opencontainers.image.created="${BUILD_DATE}"
 LABEL org.opencontainers.image.revision="${GIT_COMMIT}"
 LABEL org.opencontainers.image.source="https://git.kubistudio.cloud/kubistudio/cicd-multi-env-pipeline-poc"
 
-RUN apk add --no-cache curl
+RUN apk add --no-cache curl gettext
 
 COPY nginx.conf /etc/nginx/nginx.conf
 COPY src/ /usr/share/nginx/html/
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 7c8f8d5..f2dd1ef 100644
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -21,4 +21,9 @@ window.__ENV__ = {
 };
 EOF
 
+export APP_ENV APP_VERSION
+
+envsubst '${APP_ENV} ${APP_VERSION}' < /etc/nginx/nginx.conf > /etc/nginx/nginx.conf.tmp
+mv /etc/nginx/nginx.conf.tmp /etc/nginx/nginx.conf
+
 exec "$@"