[deployment] select .env according to env var

README.md

@@ -15,7 +15,7 @@ well with fish shell.
 Have Python >= 3.12 installed. I use [pyenv] (which in turn is installed by [homebrew]).
 
 Set up Postgresql, a role and a schema. I have it on localhost, using the
-project name for role and schema name, and password. See `.env.sample` for
+project name for role and schema name, and password. See `.env.test` for
 providing connection information.
 
 Clone the repo. `cd` into the project directory. ([direnv] should activate the

config/settings.py

@@ -10,7 +10,6 @@ https://docs.djangoproject.com/en/5.1/ref/settings/
 
 import environ
 from pathlib import Path
-import sys
 
 BASE_DIR = Path(__file__).resolve().parent.parent
 
@@ -18,10 +17,7 @@ env = environ.Env(
     DEBUG=(bool, False),
     DEPLOYMENT=(str, "Dev"),
 )
-if "pytest/__main__.py" in sys.argv[0]:
-    env.read_env(BASE_DIR / ".env.test")
-else:
-    env.read_env(BASE_DIR / ".env")
+env.read_env(env.str("ENV_PATH", BASE_DIR / ".env"))  # pyright: ignore[reportArgumentType]
 
 # See https://docs.djangoproject.com/en/5.1/howto/deployment/checklist/
 
@@ -44,12 +40,10 @@ INSTALLED_APPS = [
     "collector.apps.CollectorConfig",
 ]
 if env("DEPLOYMENT") == "Dev":
-    INSTALLED_APPS.extend(
-        [
-            "django_extensions",
-            "debug_toolbar",
-        ]
-    )
+    INSTALLED_APPS += [
+        "django_extensions",
+        "debug_toolbar",
+    ]
     SHELL_PLUS = "ipython"
 
 MIDDLEWARE = [
@@ -62,7 +56,9 @@ MIDDLEWARE = [
     "django.middleware.clickjacking.XFrameOptionsMiddleware",
 ]
 if env("DEPLOYMENT") == "Dev":
-    MIDDLEWARE.append("debug_toolbar.middleware.DebugToolbarMiddleware")
+    MIDDLEWARE += [
+        "debug_toolbar.middleware.DebugToolbarMiddleware",
+    ]
     INTERNAL_IPS = [
         "127.0.0.1",
     ]

config/test.py

@@ -0,0 +1,5 @@
+import os
+
+
+def test_we_are_using_the_correct_envpath():
+    assert os.environ.get("ENV_PATH", "") == ".env.test"

justfile

@@ -16,4 +16,4 @@ serve:
   python -m django runserver
 
 test *ARGS:
-  python -m pytest {{ARGS}}
+  ENV_PATH=.env.test python -m pytest {{ARGS}}

pyproject.toml

@@ -15,7 +15,8 @@ authors = [
 pythonpath = "."
 python_files = [
   "test_*.py",
-  "tests.py"
+  "tests.py",
+  "config/test.py",
 ]
 addopts = [
   "--create-db",