devenv: update prom random_data for go1.17 (use go install) (#38763)

* devenv: update prom random_data for go1.17 (use go install)
* restore env vars and tags to install cmd

devenv/docker/blocks/prometheus_random_data/Dockerfile

@@ -3,16 +3,11 @@
 # Builder image, where we build the example.
 FROM golang:1.17 AS builder
 # Download prometheus/client_golang/examples/random first
-RUN go get github.com/prometheus/client_golang/examples/random
-WORKDIR /go/src/github.com/prometheus/client_golang
-WORKDIR /go/src/github.com/prometheus/client_golang/prometheus
-RUN go get -d
-WORKDIR /go/src/github.com/prometheus/client_golang/examples/random
-RUN CGO_ENABLED=0 GOOS=linux go build -a -tags netgo -ldflags '-w'
+RUN CGO_ENABLED=0 GOOS=linux go install -tags netgo -ldflags '-w' github.com/prometheus/client_golang/examples/random@latest
 
 # Final image.
 FROM scratch
 LABEL maintainer "The Prometheus Authors <prometheus-developers@googlegroups.com>"
-COPY --from=builder /go/src/github.com/prometheus/client_golang/examples/random .
+COPY --from=builder /go/bin/random .
 EXPOSE 8080
 ENTRYPOINT ["/random"]