Added .env docker sample file

.env.docker.sample

@@ -0,0 +1,6 @@
+SECRET_KEY=refero34o8rfhfjn983thf39fhc943rf923n3h
+POSTGRES_USER=icarus_op_test
+POSTGRES_PASSWORD=password
+POSTGRES_DB=icarus_auth_test_db
+POSTGRES_HOST=localhost
+DATABASE_URL=postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${POSTGRES_HOST}:5432/${POSTGRES_DB}

.gitignore

@@ -1,3 +1,4 @@
 /target
 Cargo.lock
 .env
+.env.docker