Fix rex_pub_key retrieval for containerized Satellite

Author: sjha4

robottelo/hosts.py

@@ -54,7 +54,7 @@
     RHSSO_USER_UPDATE,
     SATELLITE_VERSION,
 )
-from robottelo.enums import NetworkType
+from robottelo.enums import InstallMethod, NetworkType
 from robottelo.exceptions import (
     CapsuleHostError,
     CLIFactoryError,
@@ -1775,7 +1775,19 @@ def url_katello_ca_rpm(self):
 
     @property
     def rex_pub_key(self):
-        return self.execute(f'cat {self.rex_key_path}').stdout.strip()
+        if self.install_method == InstallMethod.FOREMANCTL:
+            result = self.execute(
+                'podman exec foreman-proxy cat /var/lib/foreman-proxy/ssh/id_rsa_foreman_proxy.pub'
+            )
+        else:
+            result = self.execute(f'cat {self.rex_key_path}')
+        key = result.stdout.strip()
+        if not key:
+            raise ValueError(
+                f'Rex public key is empty. Command returned status {result.status}. '
+                f'stderr: {result.stderr}'
+            )
+        return key
 
     def is_foremanctl_available(self):
         """Check if foremanctl is installed on the system.
@@ -1805,8 +1817,6 @@ def detect_install_method(self):
         :return: InstallMethod enum value
         :rtype: InstallMethod
         """
-        from robottelo.enums import InstallMethod
-
         # Runtime override
         if hasattr(self, '_install_method_override'):
             return self._install_method_override
@@ -1855,7 +1865,6 @@ def get_service_names(self):
         :rtype: list
         """
         from robottelo.constants import InstallationServices
-        from robottelo.enums import InstallMethod
 
         if self.install_method == InstallMethod.FOREMANCTL:
             return InstallationServices.FOREMANCTL_SERVICES
@@ -2268,7 +2277,6 @@ def install_satellite(
         :param foremanctl_parameters: Parameters list for foremanctl deploy
         :return: Installation result
         """
-        from robottelo.enums import InstallMethod
         from robottelo.utils.installer import InstallerCommand
 
         # Determine method