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

* Port to GitHub actions

* Fix

* Make docs terraform registry compatible

docs/resources/bitbucketserver_project_permissions_group.md

@@ -0,0 +1,31 @@
+# Resource: bitbucketserver_project_permissions_group
+
+Set project level permissions for a given group.
+
+## Example Usage
+
+```hcl
+resource "bitbucketserver_project_permissions_group" "my-proj" {
+  project    = "MYPROJ"
+  group      = "stash-users"
+  permission = "PROJECT_WRITE"
+}
+```
+
+## Argument Reference
+
+* `project` - Required. Project key to set permissions for.
+* `group` - Required. Name of the group permissions are for.
+* `permission` - Required. The permission to grant. Available project permissions are:
+
+    * `PROJECT_READ`
+    * `PROJECT_WRITE`
+    * `PROJECT_ADMIN`
+
+## Import
+
+Import a group project level permissions via the project & group names:
+
+```
+terraform import bitbucketserver_project_permissions_group.test MYPROJ/stash-users
+```