Update generate matrix stript to use nightly_next #3120
Merged
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Update generate matrix stript to use nightly_next
Motivation:
Updating the CI parameters for changing nightly job targets with each new Swift version (6.0, 6.1, ...) is onerous. Whilst this gives us some value in the non-nightly pipelines by forcing adopters to apply thought to what is applied to each supported version, the nightlies arguably deliver less value in this regard as they tend to be non-required.
Modifications:
Change flags to refer to nightly_next rather than nightly_6_1, implement a shim so that the old environment variables still work.
Result:
We will be able to modify adopter workflows to use nightly_next terminology.
Example of a job where workflows are using the new matrix https://github.com/apple/swift-nio/actions/runs/13520016728