test_environment: simplify SINGULARITY_BIND handling

Author: mr-c

tests/test_environment.py

@@ -163,14 +163,10 @@ def PWD(v: str, env: Env) -> bool:
         if version >= Version("3.6"):
             sing_vars["SINGULARITY_COMMAND"] = "exec"
         if version >= Version("3.7"):
-            if version > Version("3.9"):
-                sing_vars["SINGULARITY_BIND"] = ""
-            else:
+            def BIND(v: str, env: Env) -> bool:
+                return True
 
-                def BIND(v: str, env: Env) -> bool:
-                    return v.startswith(tmp_prefix) and v.endswith(":/tmp")
-
-                sing_vars["SINGULARITY_BIND"] = BIND
+            sing_vars["SINGULARITY_BIND"] = BIND
         if version >= Version("3.10"):
             sing_vars["SINGULARITY_COMMAND"] = "run"
             sing_vars["SINGULARITY_NO_EVAL"] = None