minor Dockerfile changes

Author: Varunram

Dockerfile

@@ -1,17 +1,5 @@
 FROM golang:alpine AS builder
 RUN apk update && apk add --no-cache git ca-certificates && update-ca-certificates
-# Create appuser.
-ENV USER=appuser
-ENV UID=10001 
-# See https://stackoverflow.com/a/55757473/12429735RUN 
-RUN adduser \    
-    --disabled-password \    
-    --gecos "" \    
-    --home "/nonexistent" \    
-    --shell "/sbin/nologin" \    
-    --no-create-home \    
-    --uid "${UID}" \    
-    "${USER}"
 WORKDIR $GOPATH/src/github.com/YaleOpenLab/openx
 COPY . .
 RUN go get -d -v