Add OpenBSD build for some CI

[kwkwan]

Previously we had a Jenkins job to run OpenBSD builds but we need to migrate to some other provider (there doesn't seem to be a free CI service that supports OpenBSD). The Jenkins is being decommissioned.

Here's the original script:

(Master)

#!/bin/bash -x

whoami

. ci/env-openbsd.sh
./ci/before_install.sh
./ci/install.sh
./ci/main.sh

(Pull request)

#!/bin/bash -x

whoami

. ci/env-openbsd.sh
./ci/before_install.sh
./ci/install.sh
./ci/main.sh

[pablo-mendoza]

@kwkwan I can work on this, but I don't think I ahve permissions to enable cirrus ci in the retrace repo? Either that or I don't know how to do it. Once it's enabled I can work on getting it to work.

[ronaldtse]

@riataman I think Cirrus CI is already enabled for all our repos. Can you try adding the file here? Thanks!

[pablo-mendoza]

Thanks, I added FreeBSD 11.2 builds. Need to figure out what's wrong with FreeBSD 12. Also no OpenBSD support in cirrus-ci.

[ronaldtse]

This is excellent already. The rest will just take some time. Thank you @riataman !

[ligurio]

Also no OpenBSD support in cirrus-ci.

OpenBSD Support cirruslabs/cirrus-ci-docs#311

[ronaldtse]

Thanks @ligurio for letting us know! We'll do this.

[ronaldtse]

Actually, OpenBSD is not supported yet at Cirrus, so this ticket is still unactionable.