sbt-dependency-submission can handle multiple projects now

[mkurz]

Testing scalacenter/sbt-dependency-submission#84

/cc @adpi2

[adpi2]

Something went wrong when resolving the dependencies:

Failed to resolve the dependencies of compile-time-di_2.13
[error] sbt.librarymanagement.ResolveException: Error downloading com.typesafe.play:play-mailer_2.13:8.0.1+132-732c7a66-SNAPSHOT
[error]   Not found
[error]   Not found
[error]   not found: /home/runner/.ivy2/localcom.typesafe.play/play-mailer_2.13/8.0.1+132-732c7a66-SNAPSHOT/ivys/ivy.xml
[error]   not found: https://repo1.maven.org/maven2/com/typesafe/play/play-mailer_2.13/8.0.1+132-732c7a66-SNAPSHOT/play-mailer_2.13-8.0.1+132-732c7a66-SNAPSHOT.pom

https://github.com/playframework/play-mailer/actions/runs/4510934505

[mkurz]

@adpi2 The workflow is running now: https://github.com/playframework/play-mailer/actions/runs/4511227545/jobs/7943127376
However it is not working correctly: In the "dependency graph" view (https://github.com/playframework/play-mailer/network/dependencies) I can only see dependencies for "./runtimeDI/build.sbt", the other two build.sbt files are missing (root and the other sample).
Thinking about it, that totally makes sense:
We run the action three times, each time a new dependency graph snapshot gets submitted. Each snapshot overrides the previous one, therefore the last one wins...
IMHO the correct solution would look something like:

      - uses: scalacenter/sbt-dependency-submission@v2
        with:
          working-directory: .
          working-directory: ./samples/compile-timeDI/
          working-directory: ./samples/runtimeDI/
# or
      - uses: scalacenter/sbt-dependency-submission@v2
        with:
          working-directories: [".", "./samples/compile-timeDI/", "./samples/runtimeDI/" ]

That way the action only runs once, submitting only one snapshot that contains all the build.sbt files' dependencies.