darwin build

[storybehind]

A brief description of the changes in this PR:

Update release workflow to build for darwin/amd64 and darwin/arm64 Use default config if not present in ~/.zcn/

Tasks to complete before merging PR:

• [ ] Ensure system tests are passing. If not Run them manually to check for any regressions :clipboard:
• [ ] Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• [ ] Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• 0chain:
• blobber:
• gosdk:
• system_test:
• zwalletcli:
• Other: ...