feature: added bash to apk add

Dockerfile

@@ -1,10 +1,9 @@
-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!"}