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

* Port to GitHub actions

* Fix

* Make docs terraform registry compatible

docs/index.md

@@ -0,0 +1,100 @@
+# Bitbucket Server Provider
+
+[Bitbucket Server](https://www.atlassian.com/software/bitbucket) is the self-hosted version of Bitbucket.
+Whilst terraform provides a default bitbucket provider, this only works for _Bitbucket Cloud_ - this provider
+unlocks the power of terraform to manage your self-hosted Bitbucket Server instance. 
+
+## Installation
+
+### Terraform 0.13+
+
+The provider can be installed and managed automatically by Terraform. Sample `versions.tf` file :
+
+```hcl
+terraform {
+  required_version = ">= 0.13"
+
+  required_providers {
+    bitbucketserver = {
+      source  = "gavinbunney/bitbucketserver"
+    }
+  }
+}
+```
+
+### Terraform 0.12
+
+#### Install latest version
+
+The following one-liner script will fetch the latest provider version and download it to your `~/.terraform.d/plugins` directory.
+
+```bash
+$ mkdir -p ~/.terraform.d/plugins && \
+      curl -Ls https://api.github.com/repos/gavinbunney/terraform-provider-bitbucketserver/releases/latest \
+      | jq -r ".assets[] | select(.browser_download_url | contains(\"$(uname -s | tr A-Z a-z)\")) | select(.browser_download_url | contains(\"amd64\")) | .browser_download_url" \
+      | xargs -n 1 curl -Lo ~/.terraform.d/plugins/terraform-provider-bitbucketserver.zip && \
+      pushd ~/.terraform.d/plugins/ && \
+      unzip ~/.terraform.d/plugins/terraform-provider-bitbucketserver.zip -d terraform-provider-bitbucketserver-tmp && \
+      mv terraform-provider-bitbucketserver-tmp/terraform-provider-bitbucketserver* . && \
+      chmod +x terraform-provider-bitbucketserver* && \
+      rm -rf terraform-provider-bitbucketserver-tmp && \
+      rm -rf terraform-provider-bitbucketserver.zip && \
+      popd
+```
+
+#### Install manually
+
+If you don't want to use the one-liner above, you can download a binary for your system from the [release page](https://github.com/gavinbunney/terraform-provider-bitbucketserver/releases),
+then either place it at the root of your Terraform folder or in the Terraform plugin folder on your system.
+
+
+## Configuration
+
+The provider supports parameters to determine the bitbucket server and admin user/password to use.
+
+```hcl
+provider "bitbucketserver" {
+  server   = "https://mybitbucket.example.com"
+  username = "admin"
+  password = "password"
+}
+```
+
+### Authentication
+
+The `username` and `password` specified should be of a user with sufficient privileges to perform the operations you are after.
+Typically this is a user with `SYS_ADMIN` global permissions.
+
+### Environment Variables
+
+You can also specify the provider configuration using the following env vars:
+
+* `BITBUCKET_SERVER`
+* `BITBUCKER_USERNAME`
+* `BITBUCKET_PASSWORD`
+
+> Note: The hcl provider configuration takes precedence over the environment variables.
+
+## Example - Creating a Project and Repository
+
+Creating a project and repository is super simple with this provider:
+
+```hcl
+provider "bitbucketserver" {
+  server   = "https://mybitbucket.example.com"
+  username = "admin"
+  password = "password"
+}
+
+resource "bitbucketserver_project" "test" {
+  key         = "TEST"
+  name        = "test-01"
+  description = "Test project"
+}
+
+resource "bitbucketserver_repository" "test" {
+  project     = bitbucketserver_project.test.key
+  name        = "repo-01"
+  description = "Test repository"
+}
+```