Create prepared Downloads for Releases

[Flyingmana]

When we have a release, we should also have a downloadable.
While github already prepares downloads, we may want to combine them with some actions like:

• include composer dependencies
• include source from other repositories
  • for example ZF1
• special stripped down releases for areas like Amazon Lambda

In best case we can do this with Github Actions.
Alternative we need an external system creating them.

We need to make sure, they always create the exact same state, so the hash/signature of the package can get validated.

[Flyingmana]

working on a draft for it at https://github.com/Flyingmana/magento-lts/blob/release-actions/.github/workflows/release.yml

[Flyingmana]

working example of composer install and attaching 'composer.json' and 'composer.lock' to the release.

release: https://github.com/Flyingmana/magento-lts/releases/tag/0.0.15
workflow action: https://github.com/Flyingmana/magento-lts/runs/240842661
code of action: https://github.com/Flyingmana/magento-lts/blob/0.0.15/.github/workflows/release.yml

the 'composer.lock' file is the generated file to showcase the upload of files.