feat(config): add file-based secret storage fallback #48

Job	Run time
extract-api-key	10s
build-cli (windows-latest, x86_64-pc-windows-msvc, shard-cli-windows-x64)	3m 32s
build-cli (macos-latest, x86_64-apple-darwin, shard-cli-macos-x64)	2m 12s
build-cli (macos-latest, aarch64-apple-darwin, shard-cli-macos-arm64)	3m 34s
build-desktop (ubuntu-22.04, x86_64-unknown-linux-gnu, linux-x64)	5m 29s
build-desktop (windows-latest, x86_64-pc-windows-msvc, windows-x64)	7m 1s
build-desktop (macos-latest, aarch64-apple-darwin, macos-arm64)	4m 49s
build-cli (ubuntu-22.04, x86_64-unknown-linux-gnu, shard-cli-linux-x64)	1m 58s
build-desktop (macos-latest, x86_64-apple-darwin, macos-x64)	5m 52s
release	0s
	34m 37s

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