Fix typo (stringer-rss#1078)

Missing equal sign (=) in variable 'environment': ENCRYPTION_PRIMARY_KEY

Author: 0x646a73

docker-compose.yml

@@ -25,7 +25,7 @@ services:
       - stringer-network
     environment:
       - SECRET_KEY_BASE=<your configuration>
-      - ENCRYPTION_PRIMARY_KEY<your configuration>
+      - ENCRYPTION_PRIMARY_KEY=<your configuration>
       - ENCRYPTION_DETERMINISTIC_KEY=<your configuration>
       - ENCRYPTION_KEY_DERIVATION_SALT=<your configuration>
       - PORT=8080