[MTOOLCHAINS-56] Flag to fail as in maven-enforcer-plugin

[jira-importer]

Hüseyin Kartal opened MTOOLCHAINS-56 and commented

Make the toolchain optional and not fail the build if missing.

A possibility to tell toolchain just to warn. Like the enforcer-plugin https://maven.apache.org/enforcer/maven-enforcer-plugin/enforce-mojo.html#fail

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Affects: 3.2.0