Read TERCC from Kubernetes instead of environment

projects/etos_suite_runner/src/etos_suite_runner/lib/esr_parameters.py

@@ -24,6 +24,7 @@
     EiffelTestExecutionRecipeCollectionCreatedEvent,
 )
 from etos_lib import ETOS
+from etos_lib.kubernetes import Kubernetes, TestRun
 from packageurl import PackageURL
 
 from .graphql import request_artifact_created
@@ -76,7 +77,14 @@ def tercc(self) -> EiffelTestExecutionRecipeCollectionCreatedEvent:
         """
         if self.etos.config.get("tercc") is None:
             tercc = EiffelTestExecutionRecipeCollectionCreatedEvent()
-            tercc.rebuild(json.loads(os.getenv("TERCC")))
+            tercc_json = None
+            if os.getenv("TERCC") is not None:
+                # first option for backwards compatibility
+                tercc_json = json.loads(os.getenv("TERCC"))
+            else:
+                # requires testrun custom resource defined in Kubernetes
+                tercc_json = TestRun(Kubernetes()).get(os.getenv("TESTRUN"))
+            tercc.rebuild(tercc_json)
             self.etos.config.set("tercc", tercc)
         return self.etos.config.get("tercc")