Migrating Scripts to systemd

Although systemd maintains compatibility with init.d scripts, as a best practice, you must adapt the scripts that you want to run on Photon OS to systemd to avoid potential problems.

Such a conversion standardizes the scripts, reduces the footprint of your code, makes the scripts easier to read and maintain, and improves their robustness on a systemd system.

Last modified March 5, 2021: setting up github actions (3f54ed117)