Unable to launch x86-64 nightly build of CR100 on macOS

[stephendonner]

Description

Unable to launch x86-64 nightly build of CR100 on macOS (crashes and permissions dialogs)

Found while trying to test #21739

Steps to Reproduce

1. download https://brave-jenkins-build-artifacts.s3.amazonaws.com/test-brave-browser-build-macos-x64/618/Brave-Browser-Nightly-x64.dmg
2. double-click to extract
3. run the installer
4. launch Brave

Actual result:

example	example

Expected result:

No crash, and Brave launches

Reproduces how often:

100%

Brave version (brave://version info)

• Can you reproduce this issue with the current release? no
• Can you reproduce this issue with the beta channel? no
• Can you reproduce this issue with the nightly channel? no

cc @kjozwiak @emerick @LaurenWags

[stephendonner]

FWIW, it's also happening with https://brave-jenkins-build-artifacts.s3.amazonaws.com/test-brave-browser-build-macos-arm64/152/Brave-Browser-Nightly-arm64.dmg

[stephendonner]

@emerick did you want to close this one out with the info about the signing-key mishap?

[emerick]

The QA test job for Mac was accidentally run with the "CI" keychain instead of the "Release" keychain, resulting in an invalidly signed app. @mkarolin reran the job with the correct keychain and we were good.

Will follow up with @mihaiplesa to see if it would make sense to make "Release" the default (or even only) choice.

[stephendonner]

Verified PASSED using

Brave	1.38.60 Chromium: 100.0.4896.46 (Official Build) nightly (x86_64)
Revision	5ca33821b2211805855c77d334353d27c616a7ca-refs/branch-heads/4896@{#584}
OS	macOS Version 11.6.3 (Build 20G415)

and

Brave	1.38.60 Chromium: 100.0.4896.46 (Official Build) nightly (arm64)
Revision	5ca33821b2211805855c77d334353d27c616a7ca-refs/branch-heads/4896@{#584}
OS	macOS Version 11.6.4 (Build 20G417)

Confirmed able to launch without issue using both application binary and command-line, to execute.