aurweb dev playbook & fixes for aurweb playbook

aurweb role:

• Make sure that we install gunicorn and uvicorn
• Move python module installation:
  We need some modules to be installed before doing the DB init. (alembic)
• Remove double entry for starting aurweb-git-archive.timer
• Link update wrapper after creating git repo
• Fix permissions for cgit deployment
• Refactor aurweb role variables

root_ssh role:

• Add possibility to add additional ssh root keys

aur-dev.archlinux.org playbook:

• New playbook for aur dev machine(s) ("review apps")
  Goal is to spawn and provision a new VM with aurweb when an MR is created
  See: https://md.archlinux.org/devops-agenda-27-july#

playbooks/aur-dev.archlinux.org.yml

@@ -5,7 +5,7 @@
     - { role: common }
     - { role: firewalld }
     - { role: sshd }
-    - { role: root_ssh, root_additional_keys: ["moson.pub"] }
+    - { role: root_ssh }
     - { role: certbot }
     - { role: nginx }
     - { role: mariadb, mariadb_innodb_buffer_pool_size: '1G' }
@@ -15,6 +15,17 @@
     - { role: aurweb, aurweb_domain: "{{ aurdev_fqdn }}", is_prod: false }
     - { role: fail2ban }
 
+  pre_tasks:
+    - name: Update archlinux-keyring
+      pacman:
+        name: archlinux-keyring
+        update_cache: yes
+    
+    - name: Upgrade
+      pacman:
+        update_cache: yes
+        upgrade: yes
+
   post_tasks:
     - name: Install packages for dummy data generation
       pacman: