Initial commit of docker compose project generator

Creates project directory structure in /docker
Creates docker-compose.yml with sensible defaults
Creates borgmatic config in /etc/borgmatic.d
Adds proxy info to caddyfile and reloads caddy
Config file generation done via jsonnet and yq
Borgmatic configured to backup to borgbase repo

borgmatic/pre-backup-docker-compose-down.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+if [ $# -eq 0 ]; then
+    echo "Usage: $0 <folder1> [folder2] ..."
+    exit 1
+fi
+
+for folder in "$@"; do
+    cd "/docker/$folder" || {
+        echo "Directory /docker/$folder not found!"
+        continue
+    }
+
+    docker compose down --remove-orphans
+done