[New gcm-core version] GCM 2.0.886

[github-actions]

install from source: publish before attempting install (#987)

The changes from 3978b0e introduced a bug in the install from source
workflow - we were attempting to copy binaries before publishing them!
Fixing with this change.

Validated with [this passing
workflow](https://github.com/ldennington/git-credential-manager/actions/runs/3652773502)
in my fork.

https://github.com/GitCredentialManager/git-credential-manager/releases/tag/v2.0.886

[dscho]

/open pr

The workflow run was started

[rimrul]

This is also the version that should fix #4165

[dscho]

/add release note

The workflow run was started