runtime/docker: Don't add to env comments

docker.run wont tolerate in env variable any comments or empty data,
as it will try to interpret it as variable with unacceptable name.
So we can just skip comments and empty lines.

Signed-off-by: Denys Fedoryshchenko <[email protected]>

kernelci/runtime/docker.py

@@ -32,7 +32,15 @@ def __init__(self, *args, **kwargs):
     def _load_env(self):
         if self.config.env_file and os.path.isfile(self.config.env_file):
             with open(self.config.env_file, encoding='utf-8') as env:
-                return [line.strip() for line in env.readlines()]
+                env_list = []
+                for line in env.readlines():
+                    env_line = line.strip()
+                    # Skip empty lines and comments
+                    if not env_line or env_line.startswith('#'):
+                        continue
+                    env_list.append(env_line)
+
+                return env_list
         return None
 
     @classmethod