Port to GitHub actions & publish to Terraform registry (#39)

* Port to GitHub actions

* Fix

* Make docs terraform registry compatible

docs/resources/bitbucketserver_license.md

@@ -0,0 +1,35 @@
+# Resource: bitbucketserver_license
+
+Set the license for the bitbucket server.
+
+## Example Usage
+
+```hcl
+resource "bitbucketserver_license" "main" {
+  license = "AAACLg0ODAoPeNqNVEtv4jAQvudXRNpbp"
+}
+```
+
+## Argument Reference
+
+* `license` - Required. License to apply.
+
+## Attribute Reference
+
+* `creation_date` - License creation date.
+* `purchase_date` - License purchase date.
+* `expiry_date` - Expiry date of the license.
+* `maintenance_expiry_date` - Expiry date of the maintenance period.
+* `grace_period_end_date` - Grace period beyond expiry date.
+* `maximum_users` - Maximum number of users for license.
+* `unlimited_users` - Boolean flag if this is an unlimited user license.
+* `server_id` - Server ID.
+* `support_entitlement_number` - Entitlement number for support requests.
+
+## Import
+
+Import the license details:
+
+```
+terraform import bitbucketserver_license.main license
+```