Add unstable building mechanism #14

# to view logs

Job	Run time
Build extension binaries	0s
Build extension binaries / Generate matrix	6s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	3m 24s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	1m 3s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	2m 3s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	2m 35s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	59s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	3m 29s
Build extension binaries / Windows (windows_amd64_mingw, x64-mingw-static)	4m 25s
Build extension binaries / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	2m 8s
Build extension binaries / Linux (linux_amd64_musl, alpine:3, x64-linux)	55s
Build extension binaries / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	1m 9s
Build extension binaries / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	1m 13s
	23m 29s

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