Merge branch 'add-curl-test-guide' into 'master'

Add curl test plan

See merge request https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/8092



Merged-by: Achilleas Pipinellis <axil@gitlab.com>
Approved-by: Ian Baum <ibaum@gitlab.com>
Approved-by: Achilleas Pipinellis <axil@gitlab.com>
Co-authored-by: João Cunha <j.a.cunha@gmail.com>

doc/development/test-plans/index.md

@@ -9,6 +9,7 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 ## Updating components
 <!-- Keep this list sorted alphabetically. -->
+- [`curl`](upgrade-curl-testplan.md) 
 - [`exiftool`](upgrade-exiftool-testplan.md)
 - [`gitlab-exporter`](upgrade-gitlab-exporter-testplan.md)
 - [Go](upgrade-golang-testplan.md)

doc/development/test-plans/upgrade-curl-testplan.md

+---
+stage: Systems
+group: Distribution
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
+---
+
+# `curl` component upgrade test plan
+
+Copy the following test plan to a comment of the merge request that upgrades the component.
+
+````markdown
+## Test plan
+
+- [ ] Checked curl [changelog](https://curl.se/ch/) for potential breaking changes.
+- [ ] Start a new pipeline and trigger `Trigger::ee-package`.
+- Test the library:
+  - [ ] `version`
+
+    ```shell
+    IMAGE='registry.gitlab.com/gitlab-org/omnibus-gitlab/gitlab-ee:renovate-curl-curl-8-x'
+    
+    docker run -it --rm --platform="linux/amd64" \
+    $IMAGE curl --version | head -n1
+    ```
+
+  - [ ] `execution`
+
+    ```shell
+    docker run -it --rm --platform="linux/amd64" \
+    $IMAGE curl -L -so /dev/null -w "%{http_code}\n" gitlab.com
+    
+    200
+    ```
+````