Add support for secrets #1

Job	Run time
Build extension binaries / Generate matrix	19s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	46m 34s
Build extension binaries / DuckDB-Wasm	0s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	35m 1s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	22m 43s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	23m 35s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	19m 50s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	23m 56s
Deploy extension binaries / Generate matrix	20s
Deploy extension binaries / Deploy (linux_amd64)	1m 1s
Deploy extension binaries / Deploy (linux_amd64_gcc4)	1m 8s
Deploy extension binaries / Deploy (linux_arm64)	1m 2s
Deploy extension binaries / Deploy (osx_amd64)	48s
Deploy extension binaries / Deploy (osx_arm64)	48s
Deploy extension binaries / Deploy (windows_amd64)	1m 15s
	2h 58m 20s

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