Support insecure flag on artifact

[lgfa29]

Proposal

hashicorp/go-getter#319 added a new configuration to allow go-getter to fetch artifacts from sources where their TLS certificate is not trusted by the system, but Nomad has this value hard-coded to false.

nomad/client/allocrunner/taskrunner/getter/params.go

Lines 160 to 166 in f1637bd

	return &getter.Client{
	Ctx: ctx,
	Src: p.Source,
	Dst: p.Destination,
	Mode: p.Mode,
	Umask: umask,
	Insecure: false,

In some scenarios it may be useful to fetch artifacts from sources with self-signed certificates, which checksum providing some level of file tempering protection.

Use-cases

Retrieve artifacts from sources exposed with self-signed certificates.

[github-actions]

I'm going to lock this issue because it has been closed for 120 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.