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

docker-compose.jsonnet

@@ -0,0 +1,33 @@
+function(
+    project,
+    image,
+    web_port="0000:0000",
+    ports=[],
+    tag="latest",
+    restart="unless-stopped"
+)
+
+{
+    "name": project,
+    "services": {
+        "app": {
+            "image": image + ':' + tag,
+            "restart": restart,
+            "ports": std.uniq(std.sort(std.flattenArrays([ports, [web_port]]))),
+            "environment": {
+                "DOCKER_TEMPLATE_CREATED": true
+            },
+            "volumes": [
+                './data:/data'
+            ],
+            "secrets": [
+                'asecret'
+            ]
+        }
+    },
+    "secrets": {
+        "asecret": {
+            "file": './secrets/ASECRET'
+        }
+    }
+}