Apply resource pack

In config.yml, you can find this options.

pack-type: folder
namespace: betterhealthbar
build-folder: BetterHealthBar/build
merge-other-folder: []
enable-self-host: true
create-pack-mcmeta: true
self-host-port: 8163

You have to merge this build folder to your resource pack.

Or you can use self-host resource pack like this:

pack-type: zip
namespace: betterhealthbar
build-folder: BetterHealthBar/build
merge-other-folder: []
enable-self-host: true
create-pack-mcmeta: true
self-host-port: 8163

Success!