Helm packages are not rebuilt after editing

[nacardin]

When running package in k8-util/helm/Makefile, the helm chart packages are not rebuilt after editing chart templates.

[tjtelan]

Possibly we could move the creation of these .tgz files into the fluvio-cluster build script. That way we can change the trigger to rebundle helm charts by watching for changes in the entire directory.

Or the makefile rule can just always recreate new .tgz with temp names. We'd save them (by rename) if:

1. No tgz exists previously
2. New ones are different than the old ones

(The intent behind the file rename dance is to prevent running fluvio-cluster's build.rs for every build, since we'd prevent modifying the mtime of the .tgz) - https://doc.rust-lang.org/cargo/reference/build-scripts.html#rerun-if-changed

fluvio/crates/fluvio-cluster/build.rs

Lines 5 to 6 in 71dfad8

	println!("cargo:rerun-if-changed=../../k8-util/helm/pkg_sys/fluvio-chart-sys.tgz");
	println!("cargo:rerun-if-changed=../../k8-util/helm/pkg_app/fluvio-chart-app.tgz");