build: revert to using the default alpine based docker image

Build both standard and linuxserver based images.
linuxserver based images can be accessed by adding `-s6` suffix to the docker image name

Dockerfile

@@ -1,5 +1,4 @@
-FROM ghcr.io/linuxserver/baseimage-alpine:3.14
-
+FROM alpine:latest
 RUN apk --update add ca-certificates \
                      mailcap \
                      curl
@@ -7,10 +6,10 @@ RUN apk --update add ca-certificates \
 HEALTHCHECK --start-period=2s --interval=5s --timeout=3s \
   CMD curl -f http://localhost/health || exit 1
 
-# copy local files
-COPY docker/root/ /
-COPY filebrowser /usr/bin/filebrowser
+VOLUME /srv
+EXPOSE 80
 
-# ports and volumes
-VOLUME /srv /config /database
-EXPOSE 80
+COPY docker_config.json /.filebrowser.json
+COPY filebrowser /filebrowser
+
+ENTRYPOINT [ "/filebrowser" ]