Add shellfs #93

Job	Run time
prepare	5s
build / Generate matrix	23s
build / Linux (linux_amd64, ubuntu:18.04, x64-linux)	16m 4s
build / MacOS (osx_amd64, x86_64, x64-osx)	3m 3s
build / Windows (windows_amd64, x64-windows-static-md)	18m 55s
build / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	13m 4s
build / MacOS (osx_arm64, arm64, arm64-osx)	2m 48s
build / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	1m 58s
build / Windows (windows_amd64_rtools, x64-mingw-static)	37m 59s
build / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	18m 12s
build / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	1m 58s
build / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	1m 39s
deploy	0s
	1h 56m 8s

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