Adding Android Builds

[Danielku15]

In preparation for having a Skija on Android (JetBrains/skija#101) this PR adds Android builds to the toolchain. This PR includes:

• An Android build matrix to compile Skia with NDK
• Unifying a bit the argument parsing of the python scripts
• A new input for GitHub Actions to Skip any release related steps (allows better building in forks and trying out things without actually publishing a release)

I couldn't check the binaries yet so I trust that the Skia script handles the compilation well. Next step will be to extend Skija to target Android.

See latest compilation here:
https://github.com/Danielku15/skia-build/actions/runs/680600460

[nathanieloliveira]

I can't belive I spent the last day working on basically the same thing 😂. I should have checked the open PRs section.

I'm hoping this gets merged. After implementing this myself, I've arrived at essentially the same implementation as you. My only doubt is: I can't point out when you download or install the Android NDK...
Should we have a way to specify which version of the NDK to use?
Thanks

[Danielku15]

@nathanieloliveira NDK comes pre-shipped with the linux images of GitHub Actions: https://github.com/actions/virtual-environments/blob/ubuntu16/20210318.0/images/linux/Ubuntu1604-README.md

Currently by default it is pointing to 21.4.7075529. GitHub had some issues with the rollout of r22 in GitHub Actions.
actions/runner-images#2420

[nathanieloliveira]

@nathanieloliveira NDK comes pre-shipped with the linux images of GitHub Actions: https://github.com/actions/virtual-environments/blob/ubuntu16/20210318.0/images/linux/Ubuntu1604-README.md

Currently by default it is pointing to 21.4.7075529. GitHub had some issues with the rollout of r22 in GitHub Actions.
actions/virtual-environments#2420

Interesting... In my attempt, I was downloading NDK-r22 from google repos and using ubuntu latest image.

[tonsky]

Thank you! I’ll take a look soon

[tonsky]

Seems to work! https://github.com/JetBrains/skia-build/actions/runs/690480166. Merged as efb641a. Thank you!