feat: add full GitHub Actions support with permissions, environment, … #4

Job	Run time
release_build (cigen-macos-amd64, macos-latest, x86_64-apple-darwin)	9s
release_build (cigen-linux-amd64, ubuntu-latest, x86_64-unknown-linux-gnu)	9s
release_build (cigen-macos-arm64, macos-latest, aarch64-apple-darwin)	9s
release_create	4s
release_build (cigen-linux-arm64, ubuntu-latest, aarch64-unknown-linux-gnu, true)	7s
docker_image	26s
	1m 4s

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