Update CI config
Update CI config

* only run the workflows for pushes to master and develop branches and for all PRs
* remove moot `strategy` since we use one Node.js version

Signed-off-by: XhmikosR <b60f67e10123951b393d9ba15dcf79efc14744bb@gmail.com>

jacobsalmela/AdminLTE,jacobsalmela/AdminLTE,jacobsalmela/AdminLTE,jacobsalmela/AdminLTE