Podman spawner: add lazy property with Podman instance

Signed-off-by: Cleber Rosa <[email protected]>

avocado/plugins/spawners/podman.py

@@ -110,6 +110,17 @@ class PodmanSpawner(DeploymentSpawner, SpawnerMixin):
     def __init__(self, config=None, job=None):  # pylint: disable=W0231
         SpawnerMixin.__init__(self, config, job)
         self.environment = f"podman:{self.config.get('spawner.podman.image')}"
+        self._podman = None
+
+    @property
+    def podman(self):
+        if self._podman is None:
+            podman_bin = self.config.get("spawner.podman.bin")
+            try:
+                self._podman = Podman(podman_bin)
+            except PodmanException as ex:
+                LOG.error(ex)
+        return self._podman
 
     def is_task_alive(self, runtime_task):  # pylint: disable=W0221
         if runtime_task.spawner_handle is None:
@@ -268,13 +279,6 @@ async def _create_container_for_task(
 
     async def spawn_task(self, runtime_task):
         self.create_task_output_dir(runtime_task)
-        podman_bin = self.config.get("spawner.podman.bin")
-        try:
-            # pylint: disable=W0201
-            self.podman = Podman(podman_bin)
-        except PodmanException as ex:
-            LOG.error(ex)
-            return False
 
         major, minor, _ = await self.python_version
         # Return only the "to" location