docs: add recipes

lxc-metrics.nix

@@ -1,6 +1,4 @@
 {
-  config,
-  inputs,
   pkgs,
   lib,
   ...

recipes/borg-auth.bash

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+get_key() {
+  hostname=$1
+  ip=$2
+  ssh "admin@$ip" -- 'if [ ! -f /home/admin/.ssh/id_ed25519.pub ]; then ssh-keygen -t ed25519; fi'
+  pubkey=$(ssh "admin@$ip" cat '$HOME/.ssh/id*.pub')
+  echo 'command="mkdir -p /borg/'"$hostname"'; cd /borg/'"$hostname"'; borg serve --restrict-to-path /borg/'"$hostname"'", restrict '"$pubkey"
+}
+
+put_key() {
+  hostname=$1
+  ip=$2
+  line=$(get_key "$hostname" "$ip")
+  ssh -t robert@xalicas "sudo -u backup mkdir -p ~backup/.ssh; echo '$line' | sudo -u backup tee -a ~backup/.ssh/authorized_keys"
+}
+
+"$@"

recipes/minecraft-admin.md

@@ -0,0 +1,25 @@
+# Minecraft admin
+
+On the server (`./Taskfile ssh majcraft`),
+
+## run server commands
+
+```
+echo say hello > /run/minecraft/majcraft.stdin
+```
+
+## view server output
+
+```
+journalctl -xeau minecraft-server-majcraft
+```
+
+## shutdown server
+
+```
+echo stop > /run/minecraft/majcraft.stdin
+```
+or
+```
+sudo systemctl stop minecraft-server-majcraft
+```