Configure resolver, move scripts from Dockerfile to standalone files

Dockerfile

@@ -1,16 +1,14 @@
 FROM nginx
 
-ENV REST_API_READ_HOSTNAME=localhost
+ENV REST_API_READ_HOSTNAME=host.docker.internal
 ENV REST_API_READ_PORT=8081
-ENV REST_API_WRITE_HOSTNAME=localhost
+ENV REST_API_WRITE_HOSTNAME=host.docker.internal
 ENV REST_API_WRITE_PORT=8082
 
 COPY upstream.location.template /etc/nginx/
+COPY --chmod=0777 entrypoint/*.sh /docker-entrypoint.d/
 
 RUN perl -0pe 's/root\s+\/usr\/share\/nginx\/html;\s+index\s+index\.html\s+index\.htm;/proxy_pass http:\/\/\$rest_api_host;/igs' /etc/nginx/conf.d/default.conf > /etc/nginx/conf.d/default.conf.part && \
     echo "include /etc/nginx/upstream.location;" | cat - /etc/nginx/conf.d/default.conf.part > /etc/nginx/conf.d/default.conf
 
-RUN echo "envsubst '\$REST_API_READ_HOSTNAME,\$REST_API_READ_PORT,\$REST_API_WRITE_HOSTNAME,\$REST_API_WRITE_PORT' < /etc/nginx/upstream.location.template > /etc/nginx/upstream.location && cat /etc/nginx/upstream.location" > /docker-entrypoint.d/40-envsubst-upstream-location.sh && \
-    chmod a+x /docker-entrypoint.d/40-envsubst-upstream-location.sh
-
 CMD ["nginx", "-g", "daemon off;"]

entrypoint/40-envsubst-upstream-location.sh

@@ -0,0 +1,2 @@
+envsubst '$REST_API_READ_HOSTNAME,$REST_API_READ_PORT,$REST_API_WRITE_HOSTNAME,$REST_API_WRITE_PORT' < /etc/nginx/upstream.location.template > /etc/nginx/upstream.location
+cat /etc/nginx/upstream.location

entrypoint/41-resolver-configuration.sh

@@ -0,0 +1 @@
+echo resolver $(awk 'BEGIN{ORS=" "} $1=="nameserver" {print $2}' /etc/resolv.conf) ";" > /etc/nginx/conf.d/resolver.conf