API Tools Plugin should fail the build if the baseline resolution fails

[Kummallinen]

The current API Tools Plugin only prints a warning if the API baseline resolution fails.

I don't think it should be expected that developers or code reviewers search though the build logs every time to verify the API checks actually ran. This should be considered a fatal error, or at least configurable to be if you want to keep the current behaviour as default.

PDE based tooling would fail the build on a API baseline resolution failure.

Caused by

tycho/tycho-apitools-plugin/src/main/java/org/eclipse/tycho/apitools/ApiAnalysisMojo.java

Line 163 in f4752ed

log.warn("Can't resolve API baseline, API baseline check is skipped!");

[laeubi]

@Kummallinen do you like to propose a PR that makes this configurable? At best combined with an integration-test to demonstrate the issue so we can make sure it doesn't break in the future.

[Kummallinen]

@laeubi I can do that, busy with other stuff at the moment so will probably be a few weeks