This Gitpod should install Java, Android sdk, Cordova, Qrcode and Ionic and setup paths.
The bash files can be run with ./ infront of them Don't forget "tab" autofills
To create and run a basic cordova file
./a01-cordova-create.sh
Change the www/index.html file and then rebuild the project
./a02-cordova-rebuild.sh
To install more android sdk platforms
./a03-android-sdkmanager.sh
A Gitpod snapshot of this site is here
I am new to Ionic so this might take a while to get correct.
Check out this Ionic CheatSheet https://devdactic.com/ionic-cheatsheet/
And here are the ionic Docs https://ionicframework.com/docs/cli