aurweb: Make SSH faster by avoiding slow Poetry (~2,5 sec faster)

"poetry run" is very slow[1] and adds +1 second to the startup time.
This is made even worse by the fact that aurweb-git-serve is called
twice by sshd[2].

[1] https://github.com/python-poetry/poetry/issues/3502
[2] https://security.stackexchange.com/questions/123795/authorizedkeyscommand-of-sshd-config-getting-called-twice/123801#123801

roles/aurweb/tasks/main.yml

@@ -177,6 +177,8 @@
   command: poetry install
   args:
     chdir: "{{ aurweb_dir }}"
+  environment:
+    POETRY_VIRTUALENVS_IN_PROJECT: "true"
   become: true
   become_user: "{{ aurweb_user }}"
   when: release.changed or aurweb_installed.rc != 0

roles/aurweb/templates/aurweb-git-auth.sh.j2

 #!/bin/bash
-cd "{{ aurweb_dir }}"
-exec poetry run aurweb-git-auth "$@"
+exec "{{ aurweb_dir }}/.venv/bin/aurweb-git-auth" "$@"

roles/aurweb/templates/aurweb-git-serve.sh.j2

 #!/bin/bash
-cd "{{ aurweb_dir }}"
-exec poetry run aurweb-git-serve "$@"
+exec "{{ aurweb_dir }}/.venv/bin/aurweb-git-serve" "$@"