Switch from golang base image to alpine

No need to have the go development tools in our run-time image.

Signed-off-by: Toby Cabot <toby@acnodal.io>

Author: caboteria

Dockerfile

@@ -1,26 +1,20 @@
-FROM golang:1.17-alpine as builder
+FROM golang:1.17.13-alpine as builder
 
 ENV GOOS=linux
-
-WORKDIR /opt/acnodal/src
+WORKDIR /opt/epic-gateway/src
 COPY . ./
 
-# build the web service (static)
+# build the executable (static)
 RUN go build  -tags 'osusergo netgo' -o ../bin/web-service main.go
 
 
 # start fresh
-FROM golang:1.17-alpine
-ENV bin=/opt/acnodal/bin/web-service
+FROM alpine:3.16.7
 
-# copy executables from the builder image
+# copy executable from the builder image
+ENV bin=/opt/epic-gateway/bin/web-service
 COPY --from=builder ${bin} ${bin}
 
 EXPOSE 8080
 
-# The softlink is because Dockerfile variable interpolation happens at
-# run-time so if you have variables in the CMD string they won't get
-# resolved to their values.  This lets us have a hard-coded CMD string
-# that links to the image-specific command.
-RUN ln -s ${bin} /opt/acnodal/bin/cmd
-CMD ["/opt/acnodal/bin/cmd"]
+CMD ["/opt/epic-gateway/bin/web-service"]