feat: add user variables to input

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/cuddle-clusters/tests/common.rs

@@ -1,4 +1,4 @@
-use std::{cmp::Ordering, path::Path};
+use std::{cmp::Ordering, collections::HashMap, path::Path};
 
 use cuddle_clusters::{process::ProcessOpts, ConcreteComponent, IntoComponent};
 use walkdir::DirEntry;
@@ -27,6 +27,7 @@ pub(crate) async fn run_test_with_components(
         ProcessOpts {
             path: test_folder.clone(),
             output: actual.clone(),
+            variables: HashMap::default(),
         },
     )
     .await?;
@@ -37,6 +38,7 @@ pub(crate) async fn run_test_with_components(
             ProcessOpts {
                 path: test_folder,
                 output: expected.clone(),
+                variables: HashMap::default(),
             },
         )
         .await?;