Move .env setup to script and update Makefile

Author: valer-ie

.github/setup_env.sh

@@ -0,0 +1,6 @@
+#! /usr/bin/env bash
+
+if [ ! -f .env ]; 
+then
+  cp .env.example .env
+fi

Makefile

@@ -1,6 +1,6 @@
 install:
 	pip install -e ".[dev]" --config-settings editable_mode=compat
-	if [ ! -f .env ]; then cp .env.example .env; fi
+	bash .github/setup_env.sh
 
 debug:
 	FLASK_APP=policyengine_api.api FLASK_DEBUG=1 flask run --without-threads