Employ <required_files>

Author: kostrykin

tools/colorize_labels/colorize_labels.xml

@@ -14,13 +14,19 @@
     <edam_operations>
         <edam_operation>operation_3443</edam_operation>
     </edam_operations>
+    <xrefs>
+        <xref type="bio.tools">galaxy_image_analysis</xref>
+    </xrefs>
     <requirements>
         <requirement type="package" version="@TOOL_VERSION@">networkx</requirement>
         <requirement type="package" version="2.3.5">numpy</requirement>
         <requirement type="package" version="0.25.2">scikit-image</requirement>
         <requirement type="package" version="0.7.3">giatools</requirement>
         <requirement type="package" version="3.10.8">matplotlib-base</requirement>
     </requirements>
+    <required_files>
+        <include type="glob" path="*.py"/>
+    </required_files>
     <command><![CDATA[
 
     ## Inputs