add deploy preview workflow (#10324)

* add deploy preview workflow

* Update .github/workflows/deploy-pr-preview.yml

Co-authored-by: Jack Baldry <jack.baldry@grafana.com>

---------

Co-authored-by: Jack Baldry <jack.baldry@grafana.com>

.github/workflows/deploy-pr-preview.yml

@@ -0,0 +1,25 @@
+name: Deploy pr preview
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - closed
+    paths:
+      - "docs/sources/**"
+
+jobs:
+  deploy-pr-preview:
+    if: github.repository == 'grafana/mimir'
+    uses: grafana/writers-toolkit/.github/workflows/deploy-preview.yml@main
+    with:
+      sha: ${{ github.event.pull_request.head.sha }}
+      branch: ${{ github.head_ref }}
+      event_number: ${{ github.event.number }}
+      title: ${{ github.event.pull_request.title }}
+      repo: mimir
+      source_directory: docs/sources/mimir
+      website_directory: content/docs/mimir/latest
+      relative_prefix: /docs/mimir/latest/
+      index_file: true

CODEOWNERS

@@ -2,6 +2,7 @@
 * @grafana/mimir-maintainers
 
 # Documentation.
+/.github/workflows/deploy-pr-preview.yml                                    @grafana/docs-tooling @grafana/mimir-maintainers
 /.github/workflows/publish-technical-documentation-next.yml                 @grafana/docs-tooling @grafana/mimir-maintainers
 /.github/workflows/publish-technical-documentation-release-helm-charts.yml  @grafana/docs-tooling @grafana/mimir-maintainers
 /.github/workflows/publish-technical-documentation-release-mimir.yml        @grafana/docs-tooling @grafana/mimir-maintainers