build: package releases for linux arm64 architecture

[zimeg]

Changelog

Releases of installations and updates are now packaged for Linux arm64 (aarch64) architectures.

Summary

This pull request adds Linux arm64 support to the Slack CLI build, install, and auto-update pipelines 🔮 🚀

Preview

This example shows "arm64" and "amd64" are included in releases from CircleCI:

🔗 https://github.com/slackapi/slack-cli/releases/tag/v4.2.0-build-linux-arm64-feature

Testing

We're pointing #551 toward this branch to show that installations are expected at the expected CI build for development but production continues as expected:

https://downloads.slack-edge.com/slack-cli/slack_cli_4.0.1_linux_64-bit.tar.gz

https://downloads.slack-edge.com/slack-cli/slack_cli_dev_linux_amd64.tar.gz

🔗 https://github.com/slackapi/slack-cli/actions/runs/26053774174/job/76596660399?pr=551#step:3:113

📸 A snapshot build output shows the following:

$ make build-snapshot
$ file dist/slack_linux_amd64_v1/bin/slack
dist/slack_linux_amd64_v1/bin/slack: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, Go BuildID=7V2MZrE4n7UjQsapmksZ/pvvtGphKaTHlKNd5Fgwx/eiLegmm_15Te__Z7-sZY/sdjfDY4PC3VHOl8IS3_x, BuildID[sha1]=b00253eb22c51a9bfeb7f3adce2d339740b0a0d4, with debug_info, not stripped
$ file dist/slack_linux_arm64_v8.0/bin/slack
dist/slack_linux_arm64_v8.0/bin/slack: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), statically linked, Go BuildID=CchPKzuWiGqNKYXrQN4q/kqLYEo7vzFJw2svY_8JY/Ao5GvnwanbgiprHhRE4u/Gb0kpchMnawEFdChOkrb, BuildID[sha1]=011a67f96544b9b1e6411b282468008dd635ac4c, with debug_info, not stripped

Notes

• A "universal" fallback doesn't exist AFAICT so we continue to use "64-bit" with amd64 packaging. On versions before the next release - planned 4.2.0 - we continue to use that build too. Future updates will find the correct compilation.

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.66%. Comparing base (afcb85d) to head (9a2e85e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #539      +/-   ##
==========================================
+ Coverage   71.64%   71.66%   +0.02%     
==========================================
  Files         225      225              
  Lines       19074    19080       +6     
==========================================
+ Hits        13665    13674       +9     
+ Misses       4202     4201       -1     
+ Partials     1207     1205       -2     

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