fix: ensure env-vars are written in upper case (#3072)

When creating a Crew via the CLI and selecting the Azure provider, the generated .env file had environment variables in lowercase.
This commit ensures that all environment variables are written in uppercase.

src/crewai/cli/utils.py

@@ -252,7 +252,7 @@ def write_env_file(folder_path, env_vars):
     env_file_path = folder_path / ".env"
     with open(env_file_path, "w") as file:
         for key, value in env_vars.items():
-            file.write(f"{key}={value}\n")
+            file.write(f"{key.upper()}={value}\n")
 
 
 def get_crews(crew_path: str = "crew.py", require: bool = False) -> list[Crew]:

tests/cli/test_create_crew.py

@@ -9,7 +9,6 @@ from click.testing import CliRunner
 
 from crewai.cli.create_crew import create_crew, create_folder_structure
 
-
 @pytest.fixture
 def runner():
     return CliRunner()
@@ -244,3 +243,36 @@ def test_create_folder_structure_folder_name_validation():
 
             if folder_path.exists():
                 shutil.rmtree(folder_path)
+
+@mock.patch("crewai.cli.create_crew.create_folder_structure")
+@mock.patch("crewai.cli.create_crew.copy_template")
+@mock.patch("crewai.cli.create_crew.load_env_vars")
+@mock.patch("crewai.cli.create_crew.get_provider_data")
+@mock.patch("crewai.cli.create_crew.select_provider")
+@mock.patch("crewai.cli.create_crew.select_model")
+@mock.patch("click.prompt")
+def test_env_vars_are_uppercased_in_env_file(
+    mock_prompt,
+    mock_select_model,
+    mock_select_provider,
+    mock_get_provider_data,
+    mock_load_env_vars,
+    mock_copy_template,
+    mock_create_folder_structure,
+    tmp_path
+):
+    crew_path = tmp_path / "test_crew"
+    crew_path.mkdir()
+    mock_create_folder_structure.return_value = (crew_path, "test_crew", "TestCrew")
+
+    mock_load_env_vars.return_value = {}
+    mock_get_provider_data.return_value = {"openai": ["gpt-4"]}
+    mock_select_provider.return_value = "azure"
+    mock_select_model.return_value = "azure/openai"
+    mock_prompt.return_value = "fake-api-key"
+
+    create_crew("Test Crew")
+
+    env_file_path = crew_path / ".env"
+    content = env_file_path.read_text()
+    assert "MODEL=" in content