Improve release script (#494)

* Add step for releasing environment builder image

* Strip $GOPATH from strack trace

environments/fetcher/cmd/build.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o fetcher .
+CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -gcflags=-trimpath=$GOPATH -asmflags=-trimpath=$GOPATH -o fetcher .

environments/go/builder/Dockerfile

@@ -8,7 +8,6 @@ FROM golang:${GO_VERSION}
 COPY --from=0 /builder /builder
 
 ENV GOPATH /usr
-RUN go get github.com/fission/fission
 
 ADD build.sh /usr/local/bin/build