update hookshot private key installation method

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

@@ -35,8 +35,14 @@ 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/private-key.pem
-matrix_hookshot_github_private_key: 'private-key.pem'
+# set this variable to the contents of the generated and downloaded GitHub private key:
+# matrix_hookshot_github_private_key: |
+#   -----BEGIN RSA PRIVATE KEY-----
+#   0123456789ABCDEF...
+#   -----END RSA PRIVATE KEY-----
+# alternatively, leave it empty and do it manually or use matrix-aux instead, see docs/matrix-bridge-hookshot.md for info.
+matrix_hookshot_github_private_key: ''
+matrix_hookshot_github_private_key_file: '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

@@ -64,12 +64,12 @@
 
 - name: Ensure hookshot github private key file installed if github is enabled
   copy:
-    src: private-key.pem
-    dest: "{{ matrix_hookshot_base_path }}/{{ matrix_hookshot_github_private_key }}"
-    mode: 0600
+    content: "{{ matrix_hookshot_github_private_key }}"
+    dest: "{{ matrix_hookshot_base_path }}/{{ matrix_hookshot_github_private_key_file }}"
+    mode: 0400
     owner: "{{ matrix_user_username }}"
     group: "{{ matrix_user_groupname }}"
-  when: "matrix_hookshot_github_enabled|bool"
+  when: "{{ matrix_hookshot_github_enabled|bool and matrix_hookshot_github_private_key|length }}"
 
 - name: Ensure matrix-hookshot.service installed
   template: