kube-prometheus: add info about installing & compiling

build.sh

@@ -1,4 +1,7 @@
 #!/usr/bin/env bash
+
+# This script uses arg $1 (name of *.jsonnet file to use) to generate the manifests/*.yaml files.
+
 set -e
 set -x
 # only exit with zero if all commands of the pipeline exit successfully
@@ -10,4 +13,3 @@ mkdir manifests
 
                                                # optional, but we would like to generate yaml, not json
 jsonnet -J vendor -m manifests "${1-example.jsonnet}" | xargs -I{} sh -c 'cat {} | gojsontoyaml > {}.yaml; rm -f {}' -- {}
-