feature: added bash to apk add

Dockerfile

@@ -1,14 +1,13 @@
-ARG BASE_IMAGE="nginx"
+ARG BASE_IMAGE="nginx:alpine"
 
 FROM ${BASE_IMAGE}
 
 # Install ping and ip
-RUN apt update && \
+RUN apk add --no-cache iproute2 iputils nginx-mod-http-lua bash
-    apt install -y iproute2 iputils-ping
 
 # Default nginx proxy envs
-ENV NGINX_PROXY_SOURCE_PORT=${NGINX_PROXY_SOURCE_PORT:-Please configure NGINX_PROXY_SOURCE_PORT env!}
+ENV NGINX_PROXY_SOURCE_PORT=${NGINX_PROXY_SOURCE_PORT:-"Please configure NGINX_PROXY_SOURCE_PORT env!"}
-ENV NGINX_PROXY_SOURCE_ADDRESS=${NGINX_PROXY_SOURCE_ADDRESS:-Please configure NGINX_PROXY_SOURCE_ADDRESS env!}
+ENV NGINX_PROXY_SOURCE_ADDRESS=${NGINX_PROXY_SOURCE_ADDRESS:-"Please configure NGINX_PROXY_SOURCE_ADDRESS env!"}
 
 # Copy default nginx configuration
 COPY default.nginx.conf /etc/nginx/nginx.conf

default.nginx.conf

@@ -1,8 +1,14 @@
+include /etc/nginx/modules/http_lua.conf;
+
 events {}
 
+set_by_lua $nginx_proxy_source_port 'return os.getenv("$NGINX_PROXY_SOURCE_PORT")';
+set_by_lua $nginx_proxy_source_address 'return os.getenv("$NGINX_PROXY_SOURCE_ADDRESS")';
+
 stream {
     server {
-        listen ${NGINX_PROXY_SOURCE_PORT};
+
-        proxy_pass ${NGINX_PROXY_SOURCE_ADDRESS};
+        listen $nginx_proxy_source_port;
+        proxy_pass $nginx_proxy_source_address;
     }
 }