fix: render group labels in oncoprint gene views as heatmaps

workflow/resources/datavzrd/variant-calls-template.datavzrd.yaml

@@ -142,6 +142,14 @@ views:
         dataset: ?f"variant-oncoprint-{gene}"
         hidden: true
         render-table:
+          headers:
+            ?for i, annotation in enumerate(params.group_annotations.columns.values):
+              ?i + 1:
+                label: ?annotation
+                plot:
+                  heatmap:
+                    scale: ordinal
+                    color-scheme: category20
           columns:
             hgvsp:
               custom: ?varsome_link