Switch CI to GitHub Actions

[termoshtt]

• Integrate CI by AppVeyor and Travis CI into GitHub Actions.
• Add OS specific search path

Based on termoshtt#2, Resolve #38

Futures and supported platforms

target	no-features	static	system	static,system
x86_64-pc-windows-msvc	unsupported	unsupported	✔️ (vcpkg)	✔️ (vcpkg)
x86_64-pc-windows-gnu	❌	❌	❌	❌
x86_64-apple-darwin	✔️	✔️	✔️ (homebrew)	❌
x86_64-unknown-linux-gnu	✔️	✔️	✔️ (apt)	❌

• ✔️ : Tested on CI, and works well
• ❌ : Has technical problem(s) which should be fixed

Known Issues

msys2 (x86_64-pc-windows-gnu)

• -lopenblas cannot be found in CI msys2 environment for system feature

  • https://github.com/termoshtt/openblas-src/runs/991092708
  • Though it works on my PC with 5fa9701 commit

• no-feature case exits with STATUS_DLL_NOT_FOUND error for no-feature case (possibly it cannot find gfortran) https://github.com/termoshtt/openblas-src/runs/1013368553

  process didn't exit successfully: `D:\a\openblas-src\openblas-src\target\debug\deps\lib-fac6f8ac341a9ceb.exe` (exit code: 0xc0000135, STATUS_DLL_NOT_FOUND)
  

• msys2 environment sometimes causes undefined reference to gfortran components. I cannot figure out what causes this, and it often resolved when rerun the test (maybe cache problem?). https://github.com/termoshtt/openblas-src/runs/1007384029?check_suite_focus=true

  = note: D:/a/openblas-src/openblas-src/target/debug/build/openblas-src-c8044e99da530d63/out\opt/OpenBLAS/lib\libopenblas.a(sgesvd.o):sgesvd.f:(.text+0xb1b): undefined reference to `_gfortran_concat_string'
          D:/a/openblas-src/openblas-src/target/debug/build/openblas-src-c8044e99da530d63/out\opt/OpenBLAS/lib\libopenblas.a(sgesvd.o):sgesvd.f:(.text+0xde0): undefined reference to `_gfortran_concat_string'
          D:/a/openblas-src/openblas-src/target/debug/build/openblas-src-c8044e99da530d63/out\opt/OpenBLAS/lib\libopenblas.a(sgesvdx.o):sgesvdx.f:(.text+0x2033): undefined reference to `_gfortran_concat_string'
          D:/a/openblas-src/openblas-src/target/debug/build/openblas-src-c8044e99da530d63/out\opt/OpenBLAS/lib\libopenblas.a(sgesvdx.o):sgesvdx.f:(.text+0x2181): undefined reference to `_gfortran_concat_string'
          D:/a/openblas-src/openblas-src/target/debug/build/openblas-src-c8044e99da530d63/out\opt/OpenBLAS/lib\libopenblas.a(shseqr.o):shseqr.f:(.text+0x3cd): undefined reference to `_gfortran_concat_string'
          D:/a/openblas-src/openblas-src/target/debug/build/openblas-src-c8044e99da530d63/out\opt/OpenBLAS/lib\libopenblas.a(sormbr.o):sormbr.f:(.text+0x3e3): more undefined references to `_gfortran_concat_string' follow
          D:/a/openblas-src/openblas-src/target/debug/build/openblas-src-c8044e99da530d63/out\opt/OpenBLAS/lib\libopenblas.a(second_INT_ETIME.o):second_INT_ETIME.f:(.text+0x54): undefined reference to `_gfortran_etime'
          D:/a/openblas-src/openblas-src/target/debug/build/openblas-src-c8044e99da530d63/out\opt/OpenBLAS/lib\libopenblas.a(dsecnd_INT_ETIME.o):dsecnd_INT_ETIME.f:(.text+0x54): undefined reference to `_gfortran_etime'
  

Linux (official Rust container)

• apt (Rust official image is based on Debian) does not provides static version of openblas

macOS

• --features=system,static causes following error:

            "_GOMP_parallel", referenced from:
                _exec_blas in libopenblas.a(blas_server.o)
            "_omp_get_max_threads", referenced from:
                _ddot_k_NEHALEM in libopenblas.a(ddot_k_NEHALEM.o)
                _ddot_k_SANDYBRIDGE in libopenblas.a(ddot_k_SANDYBRIDGE.o)
                _zdotc_k_SANDYBRIDGE in libopenblas.a(zdotc_k_SANDYBRIDGE.o)
                _zdotu_k_SANDYBRIDGE in libopenblas.a(zdotu_k_SANDYBRIDGE.o)
                _zdotc_k_BULLDOZER in libopenblas.a(zdotc_k_BULLDOZER.o)
                _zdotu_k_BULLDOZER in libopenblas.a(zdotu_k_BULLDOZER.o)
                _ddot_k_PILEDRIVER in libopenblas.a(ddot_k_PILEDRIVER.o)
                ...
            "_omp_set_num_threads", referenced from:
                _goto_set_num_threads in libopenblas.a(blas_server.o)
            "_omp_get_num_threads", referenced from:
                _exec_blas._omp_fn.0 in libopenblas.a(blas_server.o)
          ld: symbol(s) not found for architecture x86_64
          clang: error: linker command failed with exit code 1 (use -v to see invocation)       
  

[IvanUkhov]

Great work! Thank you! Please feel free to merge and release however you see fit.

[termoshtt]

msys2 test looks still to be broken. I omit its test from this PR 😓

[termoshtt]

@IvanUkhov could you turn off AppVeyor integration? It looks that I do not have its authority.

[IvanUkhov]

I have added you on the GitHub Apps page. You should be able to install apps yourself now. However, I have granted access for AppVeyor.