📦 Discover injectors through entrypoints

This patch eliminates import-based injector discovery, switching to
distribution package-indepdendent hosting of the respective callables.

pyproject.toml

@@ -84,6 +84,16 @@ thycotic_dsv = "awx_plugins.credentials.dsv:dsv_plugin"
 thycotic_tss = "awx_plugins.credentials.tss:tss_plugin"
 aws_secretsmanager_credential = "awx_plugins.credentials.aws_secretsmanager:aws_secretmanager_plugin"
 
+[project.entry-points."awx_plugins.injector"]
+aws = "awx_plugins.credential.injectors:aws"
+azure_rm = "awx_plugins.credential.injectors:azure_rm"
+ec2 = "awx_plugins.credential.injectors:aws"
+gce = "awx_plugins.credential.injectors:gce"
+kubernetes_bearer_token = "awx_plugins.credential.injectors:kubernetes_bearer_token"
+openstack = "awx_plugins.credential.injectors:openstack"
+terraform = "awx_plugins.credential.injectors:terraform"
+vmware = "awx_plugins.credential.injectors:vmware"
+
 [project.entry-points."awx_plugins.inventory"]  # new entry points group name
 azure-rm = "awx_plugins.inventory.plugins:azure_rm"
 ec2 = "awx_plugins.inventory.plugins:ec2"

src/awx_plugins/inventory/plugins.py

@@ -8,6 +8,9 @@
 from awx_plugins.interfaces._temporary_private_container_api import (  # noqa: WPS436
     get_incontainer_path,
 )
+from awx_plugins.interfaces._temporary_private_injector_api import (  # noqa: WPS436
+    load_injector_callable,
+)
 
 import yaml
 
@@ -102,15 +105,16 @@ def _get_shared_env(
                 inventory_update.pk,
             ),  # so injector knows this is inventory
         }
+
         if self.base_injector == 'managed':
-            from awx_plugins.credentials import injectors as builtin_injectors
-
-            cred_kind = inventory_update.source.replace('ec2', 'aws')
-            if cred_kind in dir(builtin_injectors):
-                getattr(
-                    builtin_injectors,
-                    cred_kind,
-                )(
+            try:
+                inject_credential_into_env = load_injector_callable(
+                    inventory_update.source,
+                )
+            except LookupError:
+                pass  # noqa: WPS420
+            else:
+                inject_credential_into_env(
                     credential,
                     injected_env,
                     private_data_dir,