fix(base): re-add envsubst after cleanup

Author: ChandonPierre

Dockerfile

@@ -51,7 +51,7 @@ RUN CONFIG="\
 	" \
 	&& addgroup -S nginx \
 	&& adduser -D -S -h /var/cache/nginx -s /sbin/nologin -G nginx nginx \
-	&& apk add --no-cache --update --virtual .build-deps gcc libc-dev make openssl-dev pcre-dev zlib-dev linux-headers patch curl git envsubst \
+	&& apk add --no-cache --update --virtual .build-deps gcc libc-dev make openssl-dev pcre-dev zlib-dev linux-headers patch curl git  \
  	&& curl -fSL https://nginx.org/download/nginx-$NGINX_VERSION.tar.gz -o nginx.tar.gz \
 	&& git clone https://github.com/chobits/ngx_http_proxy_connect_module.git /usr/src/ngx_http_proxy_connect_module \
 	&& cd /usr/src/ngx_http_proxy_connect_module && export PROXY_CONNECT_MODULE_PATH="$(pwd)" && cd - \
@@ -76,7 +76,7 @@ RUN CONFIG="\
 	&& rm -rf /usr/src/nginx-$NGINX_VERSION \
 	\
 	# Remove -dev apks and sources
-	&& apk del .build-deps gcc libc-dev make openssl-dev pcre-dev zlib-dev linux-headers patch curl git && rm -rf /usr/src \
+	&& apk del .build-deps gcc libc-dev make openssl-dev pcre-dev zlib-dev linux-headers patch curl git && apk add envsubst && rm -rf /usr/src \
 	\
 	# forward request and error logs to docker log collector
 	&& ln -sf /dev/stdout /var/log/nginx/access.log \