new package
Using the newapkbuild program which is part of the abuild package you can create
a new template.
building a package
Enter the folder for your new package and run: abuild -r
remake index
submitting a package
First make an account and fork this repo: https://gitlab.alpinelinux.org/alpine/aports
Ensure your change is in a new branch, then once you have one commit and have followed the commit naming scheme, create your merge request.
tracking software updates
There's a pretty handy service that most of the alpine maintainers use (along with the fedora maintainers and others): https://release-monitoring.org/