Add opt-in go toolchain to CI extension template #61

Job	Run time
Extension template / Generate matrix	22s
Rust builds (using Delta extension) / Generate matrix	23s
Extension template / Windows (windows_amd64, x64-windows-static-md)	21m 40s
Extension template / Linux (linux_amd64, ubuntu:18.04, x64-linux)	6m 35s
Extension template / MacOS (osx_amd64, x86_64, x64-osx)	3m 7s
Extension template / Windows (windows_amd64_rtools, x64-mingw-static)	49m 30s
Extension template / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	1m 55s
Extension template / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	4m 43s
Extension template / MacOS (osx_arm64, arm64, arm64-osx)	7m 13s
Extension template / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	7m 20s
Extension template / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	2m 20s
Extension template / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	1m 52s
Rust builds (using Delta extension) / DuckDB-Wasm	0s
Rust builds (using Delta extension) / MacOS (osx_amd64, x86_64, x64-osx)	10m 17s
Rust builds (using Delta extension) / Linux (linux_amd64, ubuntu:18.04, x64-linux)	12m 58s
Rust builds (using Delta extension) / MacOS (osx_arm64, arm64, arm64-osx)	7m 11s
Rust builds (using Delta extension) / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	18m 55s
Rust builds (using Delta extension) / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	13m 1s
Rust builds (using Delta extension) / Windows (windows_amd64, x64-windows-static-md)	37m 45s
	3h 27m 7s

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