Build secretless-broker for Apple silicon

[szh]

Desired Outcome

GoReleaser builds Windows, Linux and Darwin-amd64 images but does not build for the new Apple M1 hardware.

See cyberark/summon#217

Implemented Changes

• Update .goreleaser.yml to build for M1 chips

Connected Issue/Story

N/A

Definition of Done

• [ ] Goreleaser generates builds for Apple silicon

Changelog

• [x] The CHANGELOG has been updated, or
• [ ] This PR does not include user-facing changes and doesn't require a CHANGELOG update

Test coverage

• [ ] This PR includes new unit and integration tests to go with the code changes, or
• [x] The changes in this PR do not require tests

Documentation

• [ ] Docs (e.g. READMEs) were updated in this PR
• [ ] A follow-up issue to update official docs has been filed here: [insert issue ID]()
• [x] This PR does not require updating any documentation

Behavior

• [ ] This PR changes product behavior and has been reviewed by a PO, or
• [ ] These changes are part of a larger initiative that will be reviewed later, or
• [x] No behavior was changed with this PR

Security

• [ ] Security architect has reviewed the changes in this PR,
• [ ] These changes are part of a larger initiative with a separate security review, or
• [x] There are no security aspects to these changes

[codeclimate[bot]]

Code Climate has analyzed commit 9decc9d8 and detected 1 issue on this pull request.

Here's the issue category breakdown:

Category	Count
Style	1

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 54.8% (0.0% change).

View more on Code Climate.

[szh]

Not high priority, closing for now