Release it testing

[mjtalbot]

This configures the rive-ios repo to be automatically built and deployed when we commit to main!

I've tested this with dry runs where I can, i think this should work.

notes:

1. merging this will trigger a build.
2. the changelog is going to be a mess for the first commit here. this is because the version numbers for rive-ios are a mess, and i do not want to go and delete tags to "fix it". we can fix the changelog with the next release (and just tell the auto change log creator to only care about changes past a given version)
3. pretty sure we can combine the jobs in the build framework script... we end up having lots of artifacts pushed out that we also read in. we save at most 20 seconds by parallelising those steps, pretty much all the action is in creating the framework)
4. i put the little npm repo taht we track into the .github space... not sure if thats the best place