chore: removes sensitive data from docker file

Reviewed-on: #13

docker-compose.yml

@@ -53,16 +53,16 @@ services:
     restart: unless-stopped
     environment:
       KC_DB: postgres
-      KC_DB_URL: jdbc:postgresql://postgres:5432/keycloak
-      KC_DB_USERNAME: keycloak
-      KC_DB_PASSWORD: CHANGE_ME_KEYCLOAK_DB_PASSWORD
+      KC_DB_URL: jdbc:postgresql://postgres:5432/${KEYCLOAK_DB_NAME}
+      KC_DB_USERNAME: ${KEYCLOAK_DB_USER}
+      KC_DB_PASSWORD: ${KEYCLOAK_DB_PASSWORD}
 
-      KEYCLOAK_ADMIN: admin
-      KEYCLOAK_ADMIN_PASSWORD: admin-KEYCLOAK-p45sw0rd
+      KEYCLOAK_ADMIN: ${KEYCLOAK_ADMIN}
+      KEYCLOAK_ADMIN_PASSWORD: ${KEYCLOAK_ADMIN_PASSWORD}
 
       KC_HTTP_ENABLED: true
       KC_PROXY_HEADERS: xforwarded
-      KC_HOSTNAME: https://oauth.miem.space
+      KC_HOSTNAME: ${KEYCLOAK_HOSTNAME}
 
       KC_HEALTH_ENABLED: true
       KC_METRICS_ENABLED: true