Added github actions to build and release #14

Job	Run time
ubuntu-latest-cmake (avx, -DMINIGPT4_AVX2=OFF)	18m 6s
ubuntu-latest-cmake (avx2, -DMINIGPT4_AVX2=ON)	18m 3s
ubuntu-latest-cmake (opencv_avx, -DMINIGPT4_AVX2=OFF -DMINIGPT4_BUILD_WITH_OPENCV=ON)	18m 4s
ubuntu-latest-cmake (opencv_avx2, -DMINIGPT4_AVX2=ON -DMINIGPT4_BUILD_WITH_OPENCV=ON)	18m 3s
macOS-latest-cmake (avx, -DMINIGPT4_AVX2=OFF)	18m 1s
macOS-latest-cmake (avx2, -DMINIGPT4_AVX2=ON)	1s
macOS-latest-cmake (opencv_avx, -DMINIGPT4_AVX2=OFF -DMINIGPT4_BUILD_WITH_OPENCV=ON)	1s
macOS-latest-cmake (opencv_avx2, -DMINIGPT4_AVX2=ON -DMINIGPT4_BUILD_WITH_OPENCV=ON)	1s
windows-latest-cmake (avx, -DMINIGPT4_AVX2=OFF)	17m 51s
windows-latest-cmake (avx2, -DMINIGPT4_AVX2=ON)	17m 49s
windows-latest-cmake (avx512, -DMINIGPT4_AVX512=ON)	17m 50s
windows-latest-cmake (opencv_avx, -DMINIGPT4_AVX2=OFF -DMINIGPT4_BUILD_WITH_OPENCV=ON)	17m 48s
windows-latest-cmake (opencv_avx2, -DMINIGPT4_AVX2=ON -DMINIGPT4_BUILD_WITH_OPENCV=ON)	17m 49s
windows-latest-cmake (opencv_avx512, -DMINIGPT4_AVX512=ON -DMINIGPT4_BUILD_WITH_OPENCV=ON)	17m 50s
release	1s
	3h 17m 18s

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