Replace hardcoded percentages with values from a file #130

Job	Run time
Build extension binaries / Generate matrix	22s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	6m 4s
Build extension binaries / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	2m 27s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	6m 18s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	21m 56s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	13m 1s
Build extension binaries / Windows (windows_amd64_rtools, x64-mingw-static)	22m 24s
Build extension binaries / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	2m 19s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	12m 44s
Build extension binaries / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	2m 9s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	15m 34s
Deploy extension binaries	0s
	1h 45m 18s

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