update hookshot github private key path and install condition

roles/matrix-bridge-hookshot/defaults/main.yml

@@ -35,8 +35,8 @@ matrix_hookshot_webhook_endpoint: "{{ matrix_hookshot_public_endpoint }}/webhook
 # https://half-shot.github.io/matrix-hookshot/setup/github.html
 matrix_hookshot_github_enabled: false
 matrix_hookshot_github_appid: ''
-# manually copy the generated and downloaded GitHub private key to /roles/matrix-bridge-hookshot/files/github-key.pem
-matrix_hookshot_github_private_key: 'github-key.pem'
+# manually copy the generated and downloaded GitHub private key to roles/matrix-bridge-hookshot/files/private-key.pem
+matrix_hookshot_github_private_key: 'private-key.pem'
 matrix_hookshot_github_secret: '' # "Webhook secret" on the GitHub App page
 matrix_hookshot_github_oauth_enabled: false
 # you need to configure oauth settings only when you have enabled oauth (optional)

roles/matrix-bridge-hookshot/tasks/setup_install.yml

@@ -70,6 +70,7 @@
     mode: 0600
     owner: "{{ matrix_user_username }}"
     group: "{{ matrix_user_groupname }}"
+  when: "matrix_hookshot_github_enabled|bool"
 
 - name: Ensure matrix-hookshot.service installed
   template: