add custom toolchain script template #122

Job	Run time
Build extension binaries / Generate matrix	24s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	7m 33s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	24m 39s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	7m 58s
Build extension binaries / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	4m 22s
Build extension binaries / Windows (windows_amd64_rtools, x64-mingw-static)	48m 49s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	15m 32s
Build extension binaries / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	4m 40s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	14m 25s
Build extension binaries / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	1m 46s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	16m 55s
Deploy extension binaries / Generate matrix	21s
Deploy extension binaries / Deploy (linux_amd64)	30s
Deploy extension binaries / Deploy (linux_amd64_gcc4)	28s
Deploy extension binaries / Deploy (linux_arm64)	27s
Deploy extension binaries / Deploy (osx_amd64)	27s
Deploy extension binaries / Deploy (osx_arm64)	28s
Deploy extension binaries / Deploy (windows_amd64)	28s
Deploy extension binaries / Deploy (windows_amd64_rtools)	30s
Deploy extension binaries / Deploy (wasm_mvp)	30s
Deploy extension binaries / Deploy (wasm_eh)	28s
Deploy extension binaries / Deploy (wasm_threads)	28s
	2h 32m 8s

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