prefetching-dependencies: Add bundler (Ruby) to supported package managers

Signed-off-by: Michal Šoltis <[email protected]>

Author: slimreaper35

docs/modules/ROOT/pages/how-tos/configuring/prefetching-dependencies.adoc

@@ -21,6 +21,9 @@ For every build, Cachi2 generates a software bill of materials (SBOM) where all
 |xref:npm[npm]
 |`JavaScript`
 
+|xref:bundler[bundler]
+|`Ruby`
+
 |xref:rpm*[rpm]
 |`N/A`
 
@@ -298,6 +301,33 @@ spec:
 * From the {ProductName} *Applications* view, go to *Activity > Latest commits*.
 //include::../partials/con_hermetic_verification.adoc[]
 
+== [[bundler]]Enabling prefetch builds for `bundler`
+
+.Prerequisites
+
+You have a `Gemfile` and a `Gemfile.lock` file in your repository that lists all the dependencies. The `Gemfile.lock` file must be up-to-date and must contain the correct versions of all the gems. To ensure that the `Gemfile.lock` file is up-to-date, run the `bundle install` command.
+
+.Procedure
+
+To prefetch dependencies for a component build, complete the following steps:
+
+. Go to the `.tekton` directory and find the `.yaml` files related to the `*pull request*` and `*push*` processes.
+. Configure the hermetic pipeline by adding the following parameters in both `.yaml` files:
+
++
+[source,yaml]
+----
+spec:
+  params:
+    - ...
+    - name: prefetch-input
+      value: '{"type": "bundler", "path": ".", "allow_binary": "false"}' <1>
+----
+<1> The `*allow_binary*` parameter specifies whether to allow gems for specific platforms. By default, the value is `false`. If you want to allow gems for specific platforms, set the value to `true`.
+
+. Create a pull request by committing your changes to the repository of the component.
+. Review and merge the pull request.
+
 == [[rpm]]Enabling prefetch builds for `rpm`
 
 Cachi2 has a dev-preview package manager capable of fetching `rpm` dependencies. This requires the use of a pair of `rpms.in.yaml` and `rpms.lock.yaml` files to be committed to your repository. You write a `rpms.in.yaml` file and the link:https://github.com/konflux-ci/rpm-lockfile-prototype?tab=readme-ov-file#what-is-this[rpm-lockfile-prototype] CLI tool resolves that to produce a `rpms.lock.yaml` file. Cachi2 fetches those specific rpms and enables your build to install them without network access.