- add `-macos-sdk` and `-macos-arch` to adjust CGO_CFLAGS and CGO_LDFLAGS
- select macOS SDK 11.1 and arch arm64 when building
- add -cgo-cflags and -cgo-ldflags to set CGO_CFLAGS and CGO_LDFLAGS
- add back /usr/local to pickup fuse headers and library
- add `-env` to cross-compile
- add macOS/arm64 to download matrix