build: add docker-compose deployment

Caddyfile

@@ -0,0 +1,18 @@
+localhost breccia-mapper-dev breccia-mapper-dev.jagraham.co.uk mapper.gcrf-breccia.com {
+
+    tls internal
+
+    root * /srv
+    file_server
+
+    @proxy_paths {
+        not path /static/*
+    }
+
+    reverse_proxy @proxy_paths http://web:8000
+
+    log {
+        output stderr
+        format single_field common_log
+    }
+}