* Add a Scala 2.13 build pipeline
This adds initial support for multiple Scala versions controlled via
the DAML_SCALA_VERSION env var and a CI job to make sure we don’t
regress. For now we only test //libs-scala/ports/... which seemed like
the easiest starting point I could find. We can incrementally expand
that over time.
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* Document pinning
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* Address review comments
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