Add CI for NIST COBOL85 test

[yutaro-sakamoto]

Add automatic execution of tests by GitHub Actions like Open-COBOL-ESQL(https://github.com/opensourcecobol/Open-COBOL-ESQL/blob/master/.github/workflows/ubuntu-test.yml)

[GitMensch]

Ideally also running make distcheck --> so the internal tests are run, too - and there's a final open-cobol-X.n.tar.gz to provide as artifact.