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

* Port to GitHub actions

* Fix

* Make docs terraform registry compatible

docs/resources/bitbucketserver_project.md

@@ -0,0 +1,30 @@
+# Resource: bitbucketserver_project
+
+Create a Bitbucket Project to hold repositories.
+
+## Example Usage
+
+```hcl
+resource "bitbucketserver_project" "test" {
+  key         = "TEST"
+  name        = "test-01"
+  description = "Test project"
+  avatar      = "data:(content type, e.g. image/png);base64,(data)"
+}
+```
+
+## Argument Reference
+
+* `key` - Required. Project key to set.
+* `name` - Required. Name of the project.
+* `description` - Optional. Description of the project.
+* `avatar` - Optional. Avatar to use containing base64-encoded image data. Format: `data:(content type, e.g. image/png);base64,(data)`
+* `public` - Optional. Flag to make the project public or private. Default `false`.
+
+## Import
+
+Import a project reference via the key:
+
+```
+terraform import bitbucketserver_project.test TEST
+```