Add Template to deploy forgejo.

This template allows deploying a forgejo en either Scaleway or Hetzner
(untested) without much knowledge about them.
It DOES require knowledge about Terragrunt and ansible. A wizard of
sorts is provided but it will not guarantee success without some
knowledge about the underlying technology.

ansible/roles/forgejo/templates/forgejo.service.j2

@@ -0,0 +1,19 @@
+[Unit]
+Description=Forgejo Git Server (Docker Compose)
+Documentation=https://forgejo.org/docs/latest/
+After=docker.service
+Requires=docker.service
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+WorkingDirectory={{ forgejo_base_path }}
+ExecStart=/usr/bin/docker compose up -d
+ExecStop=/usr/bin/docker compose down
+ExecReload=/usr/bin/docker compose restart
+TimeoutStartSec=300
+
+[Install]
+WantedBy=multi-user.target