Replace .netrc with uv environment variables (#1541)

This commit replaces .netrc with uv environment variables for installing
tools from private repositories. To store credentials, I created a new
and reusable settings file for the CLI in
`$HOME/.config/crewai/settings.json`.

The issue with .netrc files is that they are applied system-wide and are
scoped by hostname, meaning we can't differentiate tool repositories
requests from regular requests to CrewAI's API.

tests/cli/config_test.py

@@ -0,0 +1,109 @@
+import unittest
+import json
+import tempfile
+import shutil
+from pathlib import Path
+from crewai.cli.config import Settings
+
+class TestSettings(unittest.TestCase):
+    def setUp(self):
+        self.test_dir = Path(tempfile.mkdtemp())
+        self.config_path = self.test_dir / "settings.json"
+
+    def tearDown(self):
+        shutil.rmtree(self.test_dir)
+
+    def test_empty_initialization(self):
+        settings = Settings(config_path=self.config_path)
+        self.assertIsNone(settings.tool_repository_username)
+        self.assertIsNone(settings.tool_repository_password)
+
+    def test_initialization_with_data(self):
+        settings = Settings(
+            config_path=self.config_path,
+            tool_repository_username="user1"
+        )
+        self.assertEqual(settings.tool_repository_username, "user1")
+        self.assertIsNone(settings.tool_repository_password)
+
+    def test_initialization_with_existing_file(self):
+        self.config_path.parent.mkdir(parents=True, exist_ok=True)
+        with self.config_path.open("w") as f:
+            json.dump({"tool_repository_username": "file_user"}, f)
+
+        settings = Settings(config_path=self.config_path)
+        self.assertEqual(settings.tool_repository_username, "file_user")
+
+    def test_merge_file_and_input_data(self):
+        self.config_path.parent.mkdir(parents=True, exist_ok=True)
+        with self.config_path.open("w") as f:
+            json.dump({
+                "tool_repository_username": "file_user",
+                "tool_repository_password": "file_pass"
+            }, f)
+
+        settings = Settings(
+            config_path=self.config_path,
+            tool_repository_username="new_user"
+        )
+        self.assertEqual(settings.tool_repository_username, "new_user")
+        self.assertEqual(settings.tool_repository_password, "file_pass")
+
+    def test_dump_new_settings(self):
+        settings = Settings(
+            config_path=self.config_path,
+            tool_repository_username="user1"
+        )
+        settings.dump()
+
+        with self.config_path.open("r") as f:
+            saved_data = json.load(f)
+
+        self.assertEqual(saved_data["tool_repository_username"], "user1")
+
+    def test_update_existing_settings(self):
+        self.config_path.parent.mkdir(parents=True, exist_ok=True)
+        with self.config_path.open("w") as f:
+            json.dump({"existing_setting": "value"}, f)
+
+        settings = Settings(
+            config_path=self.config_path,
+            tool_repository_username="user1"
+        )
+        settings.dump()
+
+        with self.config_path.open("r") as f:
+            saved_data = json.load(f)
+
+        self.assertEqual(saved_data["existing_setting"], "value")
+        self.assertEqual(saved_data["tool_repository_username"], "user1")
+
+    def test_none_values(self):
+        settings = Settings(
+            config_path=self.config_path,
+            tool_repository_username=None
+        )
+        settings.dump()
+
+        with self.config_path.open("r") as f:
+            saved_data = json.load(f)
+
+        self.assertIsNone(saved_data.get("tool_repository_username"))
+
+    def test_invalid_json_in_config(self):
+        self.config_path.parent.mkdir(parents=True, exist_ok=True)
+        with self.config_path.open("w") as f:
+            f.write("invalid json")
+
+        try:
+            settings = Settings(config_path=self.config_path)
+            self.assertIsNone(settings.tool_repository_username)
+        except json.JSONDecodeError:
+            self.fail("Settings initialization should handle invalid JSON")
+
+    def test_empty_config_file(self):
+        self.config_path.parent.mkdir(parents=True, exist_ok=True)
+        self.config_path.touch()
+
+        settings = Settings(config_path=self.config_path)
+        self.assertIsNone(settings.tool_repository_username)

tests/cli/tools/test_main.py

@@ -82,6 +82,7 @@ def test_install_success(mock_get, mock_subprocess_run):
         capture_output=False,
         text=True,
         check=True,
+        env=unittest.mock.ANY
     )
 
     assert "Succesfully installed sample-tool" in output