personally using this image for siomiz/syncthing, periodically running the following:

docker run --rm \
    -e SOURCE=syncthing/syncthing \
    -e TARGET=siomiz/syncthing \
    -e ENV=PULSE_VERSION \
    -e TOKEN=<github api key> \
    siomiz/autobump

if the latest release tag on github syncthing/syncthing (-e SOURCE) differs from ENV PULSE_VERSION <tag> (-e ENV) line of /Dockerfile in siomiz/syncthing (-e TARGET), that <tag> in ENV line will be updated to the latest one using github API (which requires a valid github access token (-e TOKEN)), which will trigger Docker Hub's automated build.