feat: setup project for docker deploy

backend/.env.example

@@ -0,0 +1,24 @@
+# Backend environment variables #
+
+# Must be a PostgreSQL db connection string
+DATABASE_URL=postgresql://user:password@localhost:5432/mydatabase
+
+# [dev, stage, prod]
+ENVIRONMENT=dev
+
+### use the below to generate a good salt
+# import secrets
+# print(secrets.token_urlsafe(32))
+###
+HASHIDS_SALT=default-insecure-salt
+
+### use the below to generate alphabet for encoder
+# import random
+# base61 = list("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ123456789")
+# random.shuffle(base61)
+# print("".join(base61))
+###
+ENCODER_ALPHABET=CnArvIseYhld2BtZipybguVKaMx4QFkcR71DTLJEP65jUGzqmw9fSoXW83HNO
+
+### which origins are allowed to make cross origin requests (CORS)
+ALLOW_ORIGINS=http://localhost:3000,http://localhost:3030