Add Ubuntu 22.04 to CI

[JonasVautherin]

@potaito: FYI

[JonasVautherin]

Here, curl finds openssl on the system (which we don't expect for the superbuild):

2022-06-08T22:17:01.1231890Z -- Found OpenSSL: /usr/lib/x86_64-linux-gnu/libcrypto.so (found version "3.0.2")  

Which does not make sense to me since curl is build with:

2022-06-08T22:16:51.2657444Z -- Preparing external project "curl" with args:
2022-06-08T22:16:51.2658220Z -- -- -DCMAKE_INSTALL_PREFIX:PATH=/home/runner/work/MAVSDK/MAVSDK/build/release/third_party/install

And OpenSSL was built and installed there right before:

2022-06-08T22:16:50.3145344Z install libcrypto.pc -> /home/runner/work/MAVSDK/MAVSDK/build/release/third_party/install/lib/pkgconfig/libcrypto.pc
2022-06-08T22:16:50.3184326Z install libssl.pc -> /home/runner/work/MAVSDK/MAVSDK/build/release/third_party/install/lib/pkgconfig/libssl.pc
2022-06-08T22:16:50.3222658Z install openssl.pc -> /home/runner/work/MAVSDK/MAVSDK/build/release/third_party/install/lib/pkgconfig/openssl.pc

I could imagine that the FindOpenSSL.cmake changed on Ubuntu 22.04, but that does not tell me why @julianoes changes in #1797 work 🤔.

Ideas?

[julianoes]

but that does not tell me why @julianoes changes in #1797 work thinking.

My changes don't work.

[JonasVautherin]

It does build on a docker ubuntu:22.04 container. I don't get what's different here 🤔

[JonasVautherin]

So it finds OpenSSL in the system when building CURL, which is unexpected (it should find the one from our deps):

Found OpenSSL: /usr/lib/x86_64-linux-gnu/libcrypto.so (found version "3.0.2")

For re2 it finds ours:

Found OpenSSL: /home/runner/work/MAVSDK/MAVSDK/build/release/third_party/install/lib/libcrypto.a (found version "1.1.1o")

Same for mavlink and mavsdk_server:

Found OpenSSL: /home/runner/work/MAVSDK/MAVSDK/build/release/third_party/install/lib/libcrypto.a (found version "1.1.1o")

I just realized that the third_party deps don't propagate CMAKE_PREFIX_PATH... I believe they should, I just don't understand why we never had an issue before 😅.

EDIT: actually we had it for grpc and protobuf, just curl was missing it. I guess we always got lucky with the OpenSSL version on the system being compatible with ours...

[JonasVautherin]

@julianoes @potaito: I think that was it 😊

[julianoes]

Nice catch!

[potaito]

Thanks for the digging @JonasVautherin, I appreciate it!!