fix: test git connection if a private key is deployed

mentioned in merge request gitlab-org/release-tools!1867 (merged)

mentioned in merge request bigquery-loader!42 (merged)

mentioned in merge request gitlab-com/runbooks!4854 (merged)

mentioned in merge request terra-transformer!91 (merged)

mentioned in merge request asdf-gl-infra!14 (merged)

mentioned in merge request third-party-container-images!11 (merged)

mentioned in merge request !177 (merged)

mentioned in merge request slackline!92 (merged)

mentioned in merge request pmv!108 (merged)

mentioned in merge request cmbr!78 (merged)

mentioned in merge request andrewn/avitrack_exporter!7 (merged)

mentioned in merge request gitlab-com/gl-infra/platform/runway/runwayctl!2 (merged)

mentioned in merge request gcp-quota-exporter!2 (merged)