refactor(docker): move redis env config to docker (#6936)

instead of in config/application.yml

Dockerfile

@@ -71,6 +71,10 @@ ENV	DATABASE_URL="postgresql://devto:devto@db:5432/PracticalDeveloper_developmen
 ENV DB_SETUP="false" \
   DB_MIGRATE="false"
 
+# In order for redis to work, these should be set
+ENV REDIS_URL="redis://redis:6379" \
+  REDIS_SESSIONS_URL="redis://redis:6379"
+
 #
 # Let's setup the public uploads folder volume
 #

docker-compose.yml

@@ -14,6 +14,7 @@ services:
       YARN_INTEGRITY_ENABLED: "false"
       ELASTICSEARCH_URL: http://elasticsearch:9200
       REDIS_URL: redis://redis:6379
+      REDIS_SESSIONS_URL: redis://redis:6379
     volumes:
       - .:/usr/src/app
     command: bundle exec rails server -b 0.0.0.0 -p 3000

docs/installation/docker.md

@@ -50,14 +50,6 @@ well.
      GITHUB_SECRET: "ANOTHER_REAL_SECURE_KEY_HERE"
      ```
 
-   - Update the redis url variables by adding the following lines into
-     `config/application.yml`:
-
-     ```shell
-      REDIS_URL: "redis://redis:6379"
-      REDIS_SESSIONS_URL: "redis://redis:6379"
-     ```
-
    - You do not need "real" keys for basic development. Some features require
      certain keys, so you may be able to add them as you go.