feat: Improve Docker entrypoint and config handling

- Simplify Dockerfile ENTRYPOINT to delegate config handling to init.sh.
- Enhance init.sh to automatically add `--config=/config/settings.json` if no config argument is provided.

Dockerfile

@@ -29,4 +29,4 @@ VOLUME /srv /config /database
 
 EXPOSE 80
 
-ENTRYPOINT [ "tini", "--", "/init.sh", "filebrowser", "--config", "/config/settings.json" ]
+ENTRYPOINT [ "tini", "--", "/init.sh" ]

docker/alpine/init.sh

@@ -7,4 +7,19 @@ if [ ! -f "/config/settings.json" ]; then
   cp -a /defaults/settings.json /config/settings.json
 fi
 
-exec "$@"
+# Deal with the case where user does not provide a config argument
+has_config_arg=0
+for arg in "$@"; do
+  case "$arg" in
+  --config=*)
+    has_config_arg=1
+    break
+    ;;
+  esac
+done
+
+if [ "$has_config_arg" -eq 0 ]; then
+  set -- --config=/config/settings.json "$@"
+fi
+
+exec filebrowser "$@"