Add apk upgrade to upstream builder

This will ensure the latest packages are used

Author: ecordell

upstream.Dockerfile

@@ -2,7 +2,7 @@ FROM golang:1.12-alpine as builder
 LABEL stage=builder
 WORKDIR /build
 
-RUN apk update && apk add bash make git mercurial jq
+RUN apk update && apk add bash make git mercurial jq && apk upgrade
 
 # copy just enough of the git repo to parse HEAD, used to record version in OLM binaries
 COPY .git/HEAD .git/HEAD
@@ -26,4 +26,4 @@ COPY --from=builder /build/bin/catalog /bin/catalog
 COPY --from=builder /build/bin/package-server /bin/package-server
 EXPOSE 8080
 EXPOSE 5443
-CMD ["/bin/olm"]
+CMD ["/bin/olm"]