Macbook M1 Support

Can you help clarify if microfab supports Macbook M1.

I downloaded microfab-arm64 and microfab-amd64, both show errors as follows.

Execution error
```
nickxie@Nings-MacBook-Pro microfab % ./microfab-amd64
zsh: exec format error: ./microfab-amd64

nickxie@Nings-MacBook-Pro microfab % ./microfab
zsh: exec format error: ./microfab
```

Download
```
nickxie@Nings-MacBook-Pro microfab % curl -sSL https://github.com/hyperledger-labs/microfab/releases/download/v0.0.19/microfab-amd64 -o microfab-amd64

nickxie@Nings-MacBook-Pro microfab % curl -sSL https://github.com/hyperledger-labs/microfab/releases/download/v0.0.19/microfab-arm64 -o microfab
```

Directory items
```
nickxie@Nings-MacBook-Pro microfab % ll
total 51360
-rw-r--r--@ 1 nickxie staff 33250 May 15 20:28 asset-transfer-basic-typescript.tgz
drwxr-xr-x@ 12 nickxie staff 384 May 15 20:20 bin
drwxr-xr-x@ 3 nickxie staff 96 Apr 2 00:47 builders
drwxr-xr-x@ 5 nickxie staff 160 Apr 2 00:48 config
-rwxr--r--@ 1 nickxie staff 12206714 May 15 20:36 microfab
-rwxr--r--@ 1 nickxie staff 12744608 May 15 20:40 microfab-amd64
```