Adds the `--set-file key=filepath` flag to `install`, `upgrade`, `template` and `lint` sub-commands so that the content of the file at the `filepath` is set to the value for the `key`.

Resolves #1754

Dashes are not allowed in the name

This PR was approved by vote of the core maintainers. It adds Rimus, one
of the project's founders, as an emeritus Helm maintainer.

Add missing space

* Snap installation information added
Signed-off-by: Ihor Dvoretskyi <ihor@linux.com>

* Moved Snap instructions to the different section
Signed-off-by: Ihor Dvoretskyi <ihor@linux.com>

Resolves #4170

Adds the ability to specify a kubeconfig file that overrides $KUBECONFIG

Yeah, I know - very trivial, but ¯\_(ツ)_/¯ :)

By changing a string from `##---` to `---` the output written to files matches the output generated to stdout.

some minor improvements to the built-in fake

Revert "fix(helm): add `--tls-hostname` flag to tls flags."

fix(helm): add `--tls-hostname` flag to tls flags.

When using helm/tiller in tls-verify mode, 127.0.0.1 should
be listed as an IP SAN in the tiller certificate to pass
hostname verficiation of the TLS handshake.

Closes #4149

fix(helm): return when listing with no releases or nil

chore(docs): lowercase `Kind` for clarity

`Kind` being upper case makes it seem like we're referrring to
the Kind field of a Kubernetes resource but we're really talking
about the kind of helm hook in this case.
resolves #4302

Feature: allow custom description after helm release upgrade

docs(helm): add helm-cos to related helm plugins

Add check for nil in template control structure tutorial 

Some small typos:

Some small typos:
Line 92: stategies->strategies
Line 263: namepace->namespace
Line 266: ReuseName->Reuse_name

Add 'name' label to created namespaces

Support Stdin when using downloaders of plugin

Inject os.Stdin into the command of helm plugin's downloaders

chore(sprig): bump sprig to 2.15.0

The defined role does not allow Tiller to launch Kubernetes jobs

Update CONTRIBUTING.md

This change updates sprig to 2.15, which has support for generating
SSL certificates in charts from user defined CA certificates.

Migrate 'template' to 'include' in 'helm create' 

docs(release_checklist): Adds information about new release meetings