Add CI scripts

This is a back forward port of the CI scripts from cdi-1.8.x together with several fixes that make the tests green.

Let's keep the develop green once this is merged.

@k202125 @jahns @m300433 FYI

requested review from @m214003

assigned to @m300488

approved this merge request

added 7 commits

• 5acd8975 - 1 commit from branch develop
• 5648b1f8 - Fix underlinking for PIO tests and examples.
• 83b7c251 - Use SizeType in the Ruby&Python interface wrapper.
• a116268a - Apply clang-format.
• 4c577137 - Fix the NAG pthread patch.
• 023621f9 - Use values the 'BUILD_*' precious variables only if they are set to non-empty strings.
• 50a4b55d - Add CI scripts.

Compare with previous version

added 7 commits

• 35449c4b - 1 commit from branch develop
• ddacc26b - Fix underlinking for PIO tests and examples.
• 33ed7a15 - Use SizeType in the Ruby&Python interface wrapper.
• 292898f0 - Apply clang-format.
• 5199bd6f - Fix the NAG pthread patch.
• 2f251d42 - Use values the 'BUILD_*' precious variables only if they are set to non-empty strings.
• 13d673b1 - Add CI scripts.

Compare with previous version

added 1 commit

• 3e489486 - Add CI scripts.

Compare with previous version

merged