Adds support for GitHub Actions

[marceltaeumel]

Here is an example on what it will look like: https://github.com/marceltaeumel/squeak-app/actions/runs/1262385209

Details:

• Drops support for TravisCI
• Drops support for Squeak 5.0 and 5.1
• Splits up prepare.sh into prepare_image.sh, test_image.sh, prepare_bundles.sh, and deploy_bundles.sh
• Extracts prepare_image_post.sh from (original) prepare_image.sh to be used during bundle creation (such as for collecting the extra Etoys project files)
• For testing, patches smalltalkCI to support GHA via gha-support.cs in test_image.st (can be removed later; see https://github.com/hpi-swa/smalltalkCI/issues/541)
• Uses Windows platform to prepare both 32-bit and 64-bit images, and to test the images
• Uses macOS platform to create (and sign/notarize) and deploy the bundles
• All intermediate build artifacts will be uploaded during the action to remain inspectable for 90 days; this does not replace the deployment step to files.squeak.org

Next steps:

• bundle.yml: Update push: filter to only work on "squeak-trunk"
• prepare_bundles.sh: Provide secrets to prepare signing and ssh/rsync
• prepare_aio.sh: Provide secrets to sign and notarize the all-in-one for macOS
• prepare_mac.sh: Provide secrets to sign and notarize the all-in-one for macOS
• deploy_bundles.sh: Provide secrets for rsync
• Merge changes back to "squeak-5.1" and "squeak-5.2" branches, then updating build matrix, push filter, and DEPLOYMENT_BRANCH in each branch
• Enable mail delivery to squeak-dev@lists.squeakfoundation.org

I will take a look at sign/notarize soon. Maybe one of you is more experienced in this field already and can thus help out. :-)

[marceltaeumel]

Can we also address this issue (duplicate squeak.sh file) or should this go into a separate PR?

Since this is not directly related to supporting GHA, this would be a separate PR.

As part of this change, could we also consider replacing the recurring "Hi all!" commit by a GitHub action that sends the failure mail to the list (something like this)? I think this would make the commit history look cleaner and it's also more transparent. :-)

Well, GitHub Actions has no support for e-mail notification yet. Using one of the existing mail-send actions, we would need a custom e-mail account for such things. We don't have one at the moment. I would rather not use a personal one for such things.

The recurring "Hi all!" commit is not needed anymore because only Travis had those e-mail notifications, which we used for scheduled runs.

[LinqLover]

With a bit of delay, thanks for the explanations! :-)

As part of this change, could we also consider replacing the recurring "Hi all!" commit by a GitHub action that sends the failure mail to the list (something like this)? I think this would make the commit history look cleaner and it's also more transparent. :-)

Well, GitHub Actions has no support for e-mail notification yet. Using one of the existing mail-send actions, we would need a custom e-mail account for such things. We don't have one at the moment. I would rather not use a personal one for such things.

I already have a working dummy account for exactly this purpose (already using this for some other repos). If you are interested, I can DM you the credentials. :-)

Can we also address this issue (duplicate squeak.sh file) or should this go into a separate PR?

Since this is not directly related to supporting GHA, this would be a separate PR.

Just created https://github.com/squeak-smalltalk/squeak-app/issues/23, will do at any time later if no one else anticipates me. :-)