coverage job needs grcov
E.g. https://gitlab.gnome.org/GNOME/librsvg/-/jobs/1757961 :
Running after script...
$ grcov . --binary-path ./target/debug/ --source-dir . --output-type cobertura --llvm --branch --ignore-not-existing --ignore "*cargo*" -o coverage.xml
/usr/bin/bash: line 129: grcov: command not found