tests (e2e): print revision used in run_e2e

tests/e2e/run_e2e.py

@@ -18,7 +18,7 @@
 
 """Run end-to-end tests in appropriate Docker environment"""
 
-import sys
+import sys, os
 from pathlib import Path
 import tempfile
 from textwrap import dedent
@@ -128,6 +128,8 @@ def write_report_log(path, log_raw, with_ansi=False):
             f.write(log_raw)
 
 def use_e2e_env():
+    rev = os.getenv("DOCKER_LIBERVIA_REV", "dev")
+    print(f"Running tests for Libervia {rev}")
     visual = get_opt(OPT_VISUAL)
     keep_containers = get_opt(OPT_KEEP_CONTAINERS)
     keep_profiles = get_opt(OPT_KEEP_PROFILES)