feat: improved docker image volumes and permissions (#5160)

docker/common/defaults/settings.json

@@ -0,0 +1,8 @@
+{
+  "port": 80,
+  "baseURL": "",
+  "address": "",
+  "log": "stdout",
+  "database": "/database/filebrowser.db",
+  "root": "/srv"
+}

docker/common/healthcheck.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+set -e
+
+PORT=${FB_PORT:-$(jq -r .port /config/settings.json)}
+ADDRESS=${FB_ADDRESS:-$(jq -r .address /config/settings.json)}
+ADDRESS=${ADDRESS:-localhost}
+
+curl -f http://$ADDRESS:$PORT/health || exit 1