Adding ability to specify helm chart repo using environment variables

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/49520
(Covers helm charts; does not cover docker repos)

doc/topics/autodevops/index.md

@@ -737,6 +737,9 @@ also be customized, and you can easily use a [custom buildpack](#custom-buildpac
 | `AUTO_DEVOPS_DOMAIN`         | The [Auto DevOps domain](#auto-devops-base-domain). By default, set automatically by the [Auto DevOps setting](#enablingdisabling-auto-devops). This variable is deprecated and [is scheduled to be removed](https://gitlab.com/gitlab-org/gitlab-ce/issues/56959). Use `KUBE_INGRESS_BASE_DOMAIN` instead. |
 | `AUTO_DEVOPS_CHART`          | The Helm Chart used to deploy your apps; defaults to the one [provided by GitLab](https://gitlab.com/charts/auto-deploy-app).                                                             |
 | `AUTO_DEVOPS_CHART_REPOSITORY` | The Helm Chart repository used to search for charts; defaults to `https://charts.gitlab.io`. |
+| `AUTO_DEVOPS_CHART_REPOSITORY_NAME` | From Gitlab 11.11, this variable can be used to set the name of the helm repository; defaults to "gitlab" |
+| `AUTO_DEVOPS_CHART_REPOSITORY_USERNAME` | From Gitlab 11.11, this variable can be used to set a username to connect to the helm repository. Defaults to no credentials. (Also set AUTO_DEVOPS_CHART_REPOSITORY_PASSWORD) |
+| `AUTO_DEVOPS_CHART_REPOSITORY_PASSWORD` | From Gitlab 11.11, this variable can be used to set a password to connect to the helm repository. Defaults to no credentials. (Also set AUTO_DEVOPS_CHART_REPOSITORY_USERNAME) |
 | `REPLICAS`                   | The number of replicas to deploy; defaults to 1.                                                                                                                                                                              |
 | `PRODUCTION_REPLICAS`        | The number of replicas to deploy in the production environment. This takes precedence over `REPLICAS`; defaults to 1.                                                                                                         |
 | `CANARY_REPLICAS`            | The number of canary replicas to deploy for [Canary Deployments](https://docs.gitlab.com/ee/user/project/canary_deployments.html); defaults to 1                                                                              |

lib/gitlab/ci/templates/Jobs/Deploy.gitlab-ci.yml

@@ -487,7 +487,7 @@ rollout 100%:
     fi
 
     helm init --client-only
-    helm repo add gitlab ${AUTO_DEVOPS_CHART_REPOSITORY:-https://charts.gitlab.io}
+    helm repo add ${AUTO_DEVOPS_CHART_REPOSITORY_NAME:-gitlab} ${AUTO_DEVOPS_CHART_REPOSITORY:-https://charts.gitlab.io} ${AUTO_DEVOPS_CHART_REPOSITORY_USERNAME:+"--username" "$AUTO_DEVOPS_CHART_REPOSITORY_USERNAME"} ${AUTO_DEVOPS_CHART_REPOSITORY_PASSWORD:+"--password" "$AUTO_DEVOPS_CHART_REPOSITORY_PASSWORD"}
     if [[ ! -d "$auto_chart" ]]; then
       helm fetch ${auto_chart} --untar
     fi