Fix up interaction between envvars expansion and abspath in bps yaml …

…config writing

src/lsst/cmservice/handlers/jobs.py

@@ -149,7 +149,12 @@ async def _write_script(
         include_configs = []
         for to_include_ in [bps_wms_yaml_file, bps_wms_clustering_file, bps_wms_resources_file]:
             if to_include_:
-                include_configs.append(os.path.expandvars(to_include_))
+                # We want abspaths, but we need to be careful about
+                # envvars that are not yet expanded
+                to_include_ = os.path.expandvars(to_include_)
+                if "$" not in to_include_:
+                    to_include_ = os.path.abspath(to_include_)
+                include_configs.append(to_include_)
         include_configs += bps_wms_extra_files
 
         workflow_config["includeConfigs"] = include_configs