chore: lint .env file templates (#3507)

dev/reformat

@@ -10,3 +10,11 @@ fi
 
 # run ruff linter
 ruff check --fix ./api
+
+# env files linting relies on `dotenv-linter` in path
+if ! command -v dotenv-linter &> /dev/null; then
+    echo "Installing dotenv-linter ..."
+    pip install dotenv-linter
+fi
+
+dotenv-linter ./api/.env.example ./web/.env.example