Fix: Catch git error and consider /github/workspace as safe

[gmuloc]

Two Changes

1) Adding /github/workspace as a safe repo

Curent error in AVD pipeline

Molecule eos_designs_unit_tests_v4.0 > idempotence
fatal: not in a git directory
  * Run Git Verifier because CHECK_GIT is set to true
fatal: detected dubious ownership in repository at '/github/workspace'
To add an exception for this directory, call:

	git config --global --add safe.directory /github/workspace
    - No change found after running Molecule

RCA

actions/checkout#760

Verification

docker run -it --entrypoint /bin/bash action-molecule-avd:test                                                                                     
root@617f69473711:/projects#
root@617f69473711:/projects#
root@617f69473711:/projects# ls
root@617f69473711:/projects# cat ~/.github
cat: /root/.github: No such file or directory
root@617f69473711:/projects# cat ~/.gitconfig
[safe]
        directory = /github/workspace

2) Erroring if any git issue happens again

Right now 1) is a problem but more importantly when 1) fails - the action finishes as if everything is ok which is bad.

The fix to the script is able to catch if an issue occurs

Verification

local verification of the test

pstibbons@guillaumemulocher ansible-avd % sh molecule-runner.sh
Script running from /Users/gmuloc/ansible-avd
fatal: not in a git directory
  * Run Git Verifier because CHECK_GIT is set to
fatal: detected dubious ownership in repository at '/gmuloc/ansible-avd'
To add an exception for this directory, call:

        git config --global --add safe.directory /gmuloc/ansible-avd
'git status --porcelain' failed to run - something is wrong

[carlbuchmann]

LGTM!