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 +1775,21 @@ def url_katello_ca_rpm(self):
 
     @property
     def rex_pub_key(self):
-        return self.execute(f'cat {self.rex_key_path}').stdout.strip()
+        if settings.server.install_method == InstallMethod.FOREMANCTL:
+            if 'remote-execution' in self.list_foremanctl_features(enabled=True):
+                result = self.execute(
+                    f"podman exec foreman-proxy bash -c 'cat {self.rex_key_path}'"
+                )
+            else:
+                raise SatelliteHostError('remote-execution feature is not enabled')
+        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}: {result.stderr}'
+            )
+        return key
 
     def is_foremanctl_available(self):
         """Check if foremanctl is installed on the system.
@@ -1805,8 +1819,6 @@ 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 +1867,6 @@ 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
@@ -2271,7 +2282,6 @@ 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