fix: remove double-equals from test in /bin/sh

mentioned in merge request pmv!205 (merged)

mentioned in merge request gitlab-com/runbooks!5318 (merged)

mentioned in merge request gitlab-org/release-tools!2136 (merged)

mentioned in merge request terra-transformer!192 (merged)

mentioned in merge request asdf-gl-infra!22 (merged)

mentioned in merge request common-ci-tasks-images!53 (merged)

mentioned in merge request !259 (merged)

mentioned in merge request fluentd-docker!27 (merged)

mentioned in merge request woodhouse!209 (merged)

mentioned in merge request es-diagnostics!15

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/common!237 (merged)

mentioned in merge request slackline!132 (merged)

mentioned in merge request cmbr!143 (merged)

mentioned in merge request bigquery-loader!62 (merged)

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

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

mentioned in merge request es-diagnostics!18