feat: add caddy config files

caddy/README.md

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+# Configuration de `caddy`
+
+Reverse proxy pour cohabit.
+
+## Port
+
+`localhost:80` `localhost:443`
+
+## Emplacements
+
+- `./caddy/*` -> `/etc/caddy/*`
+- `./systemd/*` -> `/etc/systemd/system/*`

caddy/caddy/Caddyfile

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+localhost:80,
+cohabit.fr {
+	# Website entry point
+
+	encode zstd gzip
+	reverse_proxy 127.0.0.1:8000
+}
+
+www.cohabit.fr {
+	# Redirect "www" subdomain to main website entry point
+	redir https://cohabit.fr{uri} permanent
+}
+
+git.cohabit.fr {
+	# Forgejo instance for cohabit
+	
+	reverse_proxy 127.0.0.1:10001
+}
+
+projets.cohabit.fr {
+	# Redmine instance for cohabit
+
+	reverse_proxy 127.0.0.1:33037
+}

caddy/systemd/caddy.service

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+# caddy.service
+#
+# For using Caddy with a config file.
+#
+# Make sure the ExecStart and ExecReload commands are correct
+# for your installation.
+#
+# See https://caddyserver.com/docs/install for instructions.
+#
+# WARNING: This service does not use the --resume flag, so if you
+# use the API to make changes, they will be overwritten by the
+# Caddyfile next time the service is restarted. If you intend to
+# use Caddy's API to configure it, add the --resume flag to the
+# `caddy run` command or use the caddy-api.service file instead.
+
+[Unit]
+Description=Caddy
+Documentation=https://caddyserver.com/docs/
+After=network.target network-online.target
+Requires=network-online.target
+
+[Service]
+Type=notify
+User=caddy
+Group=caddy
+ExecStart=/usr/local/bin/caddy run --environ --config /etc/caddy/Caddyfile
+ExecReload=/usr/local/bin/caddy reload --config /etc/caddy/Caddyfile --force
+TimeoutStopSec=5s
+LimitNOFILE=1048576
+PrivateTmp=true
+ProtectSystem=full
+AmbientCapabilities=CAP_NET_ADMIN CAP_NET_BIND_SERVICE
+
+[Install]
+WantedBy=multi-user.target