Rename changelog to correct issue number, be more explicit that we're talking...

Rename changelog to correct issue number, be more explicit that we're talking about Auto DevOps projects

changelogs/unreleased/64081-override-helm-release-name.yml

+---
+title: Allow multiple Auto DevOps projects to deploy to a single namespace within a k8s cluster
+merge_request: 30360
+author: James Keogh
+type: added

doc/topics/autodevops/index.md

@@ -764,6 +764,7 @@ also be customized, and you can easily use a [custom buildpack](#custom-buildpac
 | `ROLLOUT_RESOURCE_TYPE`     | From GitLab 11.9, this variable allows specification of the resource type being deployed when using a custom helm chart. Default value is `deployment`. |
 | `ROLLOUT_STATUS_DISABLED`   | From GitLab 12.0, this variable allows to disable rollout status check because it doesn't support all resource types, for example, `cronjob`. |
 | `HELM_UPGRADE_EXTRA_ARGS`   | From GitLab 11.11, this variable allows extra arguments in `helm` commands when deploying the application. Note that using quotes will not prevent word splitting. **Tip:** you can use this variable to [customize the Auto Deploy helm chart](https://docs.gitlab.com/ee/topics/autodevops/index.html#custom-helm-chart) by applying custom override values with `--values my-values.yaml`. |
+| `HELM_RELEASE_NAME`   | From GitLab 12.1, this variable allows the `helm` release name to be overridden, this can be used to assign unique release names when deploying multiple projects to a single namespace  |
 
 TIP: **Tip:**
 Set up the replica variables using a

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

@@ -243,7 +243,8 @@ rollout 100%:
 
 .deploy_helpers: &deploy_helpers |
   [[ "$TRACE" ]] && set -x
-  auto_database_url=postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${CI_ENVIRONMENT_SLUG}-postgres:5432/${POSTGRES_DB}
+  export RELEASE_NAME=${HELM_RELEASE_NAME:-$CI_ENVIRONMENT_SLUG}
+  auto_database_url=postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${RELEASE_NAME}-postgres:5432/${POSTGRES_DB}
   export DATABASE_URL=${DATABASE_URL-$auto_database_url}
   export TILLER_NAMESPACE=$KUBE_NAMESPACE
 
@@ -307,7 +308,7 @@ rollout 100%:
   }
 
   function deploy_name() {
-    name="$CI_ENVIRONMENT_SLUG"
+    name="$RELEASE_NAME"
     track="${1-stable}"
 
     if [[ "$track" != "stable" ]]; then
@@ -372,7 +373,7 @@ rollout 100%:
         --set service.enabled="$service_enabled" \
         --set gitlab.app="$CI_PROJECT_PATH_SLUG" \
         --set gitlab.env="$CI_ENVIRONMENT_SLUG" \
-        --set releaseOverride="$CI_ENVIRONMENT_SLUG" \
+        --set releaseOverride="$RELEASE_NAME" \
         --set image.repository="$image_repository" \
         --set image.tag="$image_tag" \
         --set image.pullPolicy=IfNotPresent \
@@ -413,7 +414,7 @@ rollout 100%:
         --set service.enabled="$service_enabled" \
         --set gitlab.app="$CI_PROJECT_PATH_SLUG" \
         --set gitlab.env="$CI_ENVIRONMENT_SLUG" \
-        --set releaseOverride="$CI_ENVIRONMENT_SLUG" \
+        --set releaseOverride="$RELEASE_NAME" \
         --set image.repository="$image_repository" \
         --set image.tag="$image_tag" \
         --set image.pullPolicy=IfNotPresent \