When xmllint is not in PATH, the grep fallback in read_pom() captured
both <artifactId> and <version> in a single multi-line string and
returned it for every call. Concatenating it with ':' produced an
invalid Docker tag like:
test-quarkus\n1.0.0-SNAPSHOT:test-quarkus\n1.0.0-SNAPSHOT
causing 'docker build' to fail with 'invalid reference format'.
Add a third 'tag' argument to read_pom() so the fallback extracts
only the requested element, and pass 'artifactId' / 'version' from
the call sites.
Also enrich pom.xml with <name> and <description> for Maven/IDE
metadata, without changing the image identity.
Tests cover the no-xmllint path explicitly (PATH stripped to
reproduce the vm-compilador environment) and the override path.
darroyo
57af30fdd2