[2.x] Report error if output file of a cached task is not in the output directory

[adpi2]

In the ActionCache, we check that all output files are in the output directory. If they are not, we still run the task, but we print an error message saying that the task could not be cached. Also the cache summary details the number of errors.

sbt:root> compile
[success] elapsed time: 0 s, cache 0%, 1 onsite task
sbt:root> set root / target := baseDirectory.value / "custom-target"
...
sbt:root> compile
[error] Cannot cache task because its output files are outside the output directory: 
[error]   - ${BASE}/custom-target/zinc/inc_compile_3.zip
[error]   - ${BASE}/custom-target/sbt2-test_3-0.1.0-SNAPSHOT-noresources.jar
[success] elapsed time: 0 s, cache 0%, 1 error
sbt:root>

[adpi2]

I am not sure why but Java Adopt 8 does not seem to be available on the latest MacOS runner anymore:

Run actions/setup-java@v3
Installed distributions
  Trying to resolve the latest version from remote
  Error: Could not find satisfied version for SemVer '8'. 
  Available versions: 21.0.3+9.0.LTS, 21.0.2+13.0.LTS, 21.0.1+12.0.LTS, 21.0.0+35.0.LTS, 20.0.2+9, 20.0.1+9, 20.0.0+36, 19.0.2+7, 19.0.1+10, 19.0.0+36, 18.0.2+101, 18.0.2+9, 18.0.1+10, 18.0.0+36, 17.0.11+9, 17.0.10+7, 17.0.9+9, 17.0.8+101, 17.0.8+7, 17.0.7+7, 17.0.6+10, 17.0.5+8, 17.0.4+101, 17.0.4+8, 17.0.3+7, 17.0.2+8, 17.0.1+12, 17.0.0+35, 11.0.23+9, 11.0.[22](https://github.com/sbt/sbt/actions/runs/8813675838/job/24239977527?pr=7539#step:6:23)+7.1, 11.0.22+7, 11.0.21+9, 11.0.20+101, 11.0.20+8, 11.0.19+7, 11.0.18+10, 11.0.17+8, 11.0.16+101, 11.0.16+8, 11.0.15+10

[eed3si9n]

I guess as long as one of the tests use JDK 8 to make sure we can build, the others can use JDK 17 or whatever?

[adpi2]

So it seems the latest MacOS runner bumped from macos-12 to macos-14-arm64 which is why Java 8 and Python 3.7 are not available anymore.

I tried bumping to Java 11 and Python 3.12 but the job failed. I rolled back to macos-12 instead.

[adpi2]

It's ready to review

[eed3si9n]

Thanks!