feat: pre-build Grafana provider

Author: commiterate

provider.json

@@ -20,6 +20,7 @@
   "gitlab": "gitlabhq/gitlab@~> 18.0",
   "google": "google@~> 6.0",
   "googlebeta": "google-beta@~> 6.0",
+  "grafana": "grafana/grafana@~> 3.0",
   "hcp": "hcp@~> 0.45",
   "helm": "helm@~> 2.3",
   "http": "http@~> 3.1",