Add OpenBSD to GitLab CI
Ensure BIND can be tested on OpenBSD in GitLab CI to more quickly catch build and test errors on that operating system.
Some notes:
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While GCC is packaged for OpenBSD, only old versions (4.2.1, 4.9.4) are readily available and none of them is the default system compiler, so we are only doing Clang builds in GitLab CI.
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Unit tests are currently not run on OpenBSD because it ships with an old version of kyua which does not handle skipped tests properly. These jobs will be added when we move away from using kyua in the future as the test code itself works fine.
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All OpenBSD jobs are run inside QEMU virtual machines, using GitLab Runner Custom executor.
Closes: #148 (closed)
Edited by Ondřej Surý