Add docs how to skip TF artifacts installation (#1042)

Add docs how to skip TF artifacts installation

Related to packit/packit-service#2787
RELEASE NOTES BEGIN
N/A
RELEASE NOTES END

Reviewed-by: Matej Focko

Author: softwarefactory-project-zuul[bot]

docs/configuration/examples.md

@@ -561,6 +561,13 @@ do not change it.
 
 </details>
 
+<details>
+  <summary>Skipping artifacts installation</summary>
+
+Done via `tmt` setup, see [here](/docs/configuration/upstream/tests#skip-installation-of-artifacts).
+
+</details>
+
 ### Fedora release automation
 
 <details>

docs/configuration/upstream/tests.md

@@ -265,6 +265,17 @@ prepare:
         - setup/packages.yml
 ```
 
+### Skip installation of artifacts
+In certain scenarios, you may want to skip the installation of artifacts. 
+To do this, include the following in your `prepare` step:
+
+```yaml
+prepare:
+  - how: install
+    exclude:
+      - ".*"
+```
+
 ### Apache Test
 
 Here is an example of a simple integration test for the web server `httpd` and `curl` utility: