fix: use default config if input config is empty

action.yaml

@@ -4,7 +4,7 @@ description: Use Updatecli to update deployments for ArgoCD
 inputs:
   updatecli-config:
     description: Override default updatecli config
-    default: ${{ forge.action_path }}/updatecli.yaml
+    default: ""
   registry-url:
     description: Registry URL
     default: git.cleverthis.com
@@ -59,6 +59,11 @@ runs:
           echo "Unknown target branch. We are not coming from main, master, nor develop branch."
           exit 1
         fi
+        
+        configFilePath="${{ inputs.updatecli-config }}"
+        if [ -z "$configFilePath" ]; then
+          configFilePath="${{ forge.action_path }}/updatecli.yaml"
+        fi
 
         export TARGET_BRANCH
-        updatecli apply --config ${{ inputs.updatecli-config }}
+        updatecli apply --config "$configFilePath"