add git & ssh

[DimaGolomozy]

Description

when running mockery using docker, it fail to download private repositories.
after configuring the env variable GOPRIVATE and mounting the ~/.netrc it still fails because of missing git
and when using ssh got download the repositories its missing ssh

• Fixes # (issue)
• Mockery failing to run when having private repositories as dependencies #619
• mockery Error parsing file could not import golang.org/x/sync/semaphore (invalid package name: \"\") #514

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Version of Go used when building/testing:

• 1.20
• 1.21
• 1.22
• 1.23

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes