Use a proxy config that works

awx/ui_next/Dockerfile

@@ -1,10 +1,8 @@
 FROM node:10
 ARG NPMRC_FILE=.npmrc
 ENV NPMRC_FILE=${NPMRC_FILE}
-ARG TARGET_HOST='awx'
-ENV TARGET_HOST=${TARGET_HOST}
-ARG TARGET_PORT=8043
-ENV TARGET_PORT=${TARGET_PORT}
+ARG TARGET='https://awx:8043'
+ENV TARGET=${TARGET}
 ENV CI=true
 WORKDIR /ui_next
 ADD public public