chore: simplify environment variable definitions in Docker configurations

- Removed default value syntax for `DB_CONNECTION_STRING`, `REDIS_HOST`, and `REDIS_PORT` in `docker-stack.server.yml` and GitHub Actions workflow to streamline configuration.
- Ensured consistency in service connection strings across both files.

Signed-off-by: Innei <tukon479@gmail.com>

Author: Innei

.github/workflows/release.yml

@@ -200,9 +200,9 @@ jobs:
           MX_PORT=${MX_PORT:-2333}
           ALLOWED_ORIGINS=${ALLOWED_ORIGINS:-localhost:*}
           # For Swarm stack name `mx-core`, service names are `mx-core_mongo` / `mx-core_redis`
-          DB_CONNECTION_STRING=${DB_CONNECTION_STRING:-mongodb://mx-core_mongo:27017/mx-space}
-          REDIS_HOST=${REDIS_HOST:-mx-core_redis}
-          REDIS_PORT=${REDIS_PORT:-6379}
+          DB_CONNECTION_STRING=mongodb://mx-core_mongo:27017/mx-space
+          REDIS_HOST=mx-core_redis
+          REDIS_PORT=6379
           ENCRYPT_ENABLE=${ENCRYPT_ENABLE:-true}
           ENCRYPT_KEY=${ENCRYPT_KEY:-}
           JWT_SECRET=${JWT_SECRET:-}

docker-stack.server.yml

@@ -17,12 +17,11 @@ services:
 
       # MongoDB (service in this stack)
       # NOTE: In Docker Swarm stack, service names are prefixed with the stack name,
-      # e.g. `mx-core_mongo` / `mx-core_redis`. If you deploy the stack with a
-      # different name, override these via env.
-      DB_CONNECTION_STRING: ${DB_CONNECTION_STRING:-mongodb://mx-core_mongo:27017/mx-space}
+      # e.g. `mx-core_mongo` / `mx-core_redis`.
+      DB_CONNECTION_STRING: mongodb://mx-core_mongo:27017/mx-space
 
       # Redis (service in this stack)
-      REDIS_HOST: ${REDIS_HOST:-mx-core_redis}
+      REDIS_HOST: mx-core_redis
       REDIS_PORT: "6379"
 
       # Security (optional)