Add support for repo_gpgcheck, which should default to 0 since HashiCorp does not sign this repo (vs the RPMs in the repo, which are signed).

Without this, RHEL-like nodes with a global `repo_gpgcheck=1` setting will not be able to use this repo.  This global setting is required on many hardened systems.

manifests/repo.pp

@@ -25,6 +25,7 @@ class hashi_stack::repo (
   Stdlib::HTTPSUrl $key_source = 'https://apt.releases.hashicorp.com/gpg',
   String $description = 'HashiCorp package repository.',
   String $rpm_base = 'https://rpm.releases.hashicorp.com',
+  Integer[0,1] $repo_gpgcheck = 0,
 ) {
   case $facts['os']['family'] {
     'Debian': {
@@ -53,6 +54,7 @@ class hashi_stack::repo (
         baseurl       => "${rpm_base}/RHEL/\$releasever/\$basearch/stable",
         gpgcheck      => 1,
         gpgkey        => $key_source,
+        repo_gpgcheck => $repo_gpgcheck,
         enabled       => 1,
         proxy         => $proxy,
         priority      => $priority,