feat(gitea): Migrate configuration from environment variables to app.ini

- Move all Gitea configuration from docker-compose.yml environment variables to app.ini
- Enable Redis cache with proper connection string format (redis://)
- Fix Redis password to use Gitea Redis instance password (gitea_redis_password) instead of application Redis stack password
- Add database connection pool settings to prevent timeout errors
- Configure Redis for cache, session, and queue using app.ini
- Update Ansible task to use correct Redis password for Gitea Redis instance

Benefits:
- Cache now works correctly (environment variables had a bug in Gitea 1.25)
- All settings are versioned in Git
- Better maintainability and reliability
- Configuration follows Gitea documentation recommendations

deployment/stacks/gitea/docker-compose.yml

@@ -10,41 +10,18 @@ services:
       - traefik-public
       - gitea-internal
     environment:
+      # Container-specific settings only
       - TZ=Europe/Berlin
       - USER_UID=1000
       - USER_GID=1000
+      # Postgres password for postgres container (not for Gitea config)
       - POSTGRES_PASSWORD=gitea_password
-      - GITEA__database__DB_TYPE=postgres
-      - GITEA__database__HOST=postgres:5432
-      - GITEA__database__NAME=${POSTGRES_DB:-gitea}
-      - GITEA__database__USER=${POSTGRES_USER:-gitea}
-      - GITEA__database__PASSWD=${POSTGRES_PASSWORD:-gitea_password}
-      # Database connection pool settings to prevent "Timeout before authentication" errors
-      # These limit the number of concurrent connections and prevent connection pool exhaustion
-      # - MAX_OPEN_CONNS: Maximum number of open connections to the database
-      # - MAX_IDLE_CONNS: More warm connections to avoid constantly creating new sessions
-      # - CONN_MAX_LIFETIME: 10 minutes; idle connections are not recycled too quickly
-      # - CONN_MAX_IDLE_TIME: Clean up connections that are idle for too long
-      - GITEA__database__MAX_OPEN_CONNS=50
-      - GITEA__database__MAX_IDLE_CONNS=30
-      - GITEA__database__CONN_MAX_LIFETIME=600
-      - GITEA__database__CONN_MAX_IDLE_TIME=300
-      # Cache, Session, and Queue configuration via environment variables
-      # These override app.ini settings and are applied on every container start
-      # NOTE: Cache deaktiviert - Gitea 1.25 interpretiert GITEA__cache__HOST nicht korrekt
-      # (verbindet sich mit 127.0.0.1:6379 statt redis:6379). Session und Queue nutzen weiterhin Redis.
-      - GITEA__cache__ENABLED=false
-      - GITEA__cache__ADAPTER=memory
-      - GITEA__session__PROVIDER=redis
-      - GITEA__session__PROVIDER_CONFIG=network=tcp,addr=redis:6379,password=${REDIS_PASSWORD:-gitea_redis_password},db=0,pool_size=100,idle_timeout=180
-      - GITEA__queue__TYPE=redis
-      - GITEA__queue__CONN_STR=redis://:${REDIS_PASSWORD:-gitea_redis_password}@redis:6379/0
-      - GITEA__server__DOMAIN=${GITEA_DOMAIN:-git.michaelschiemer.de}
-      - GITEA__server__ROOT_URL=https://${GITEA_DOMAIN:-git.michaelschiemer.de}/
-      - GITEA__server__SSH_DOMAIN=${GITEA_DOMAIN:-git.michaelschiemer.de}
-      - GITEA__server__SSH_PORT=2222
-      - GITEA__service__DISABLE_REGISTRATION=${DISABLE_REGISTRATION:-true}
-      - GITEA__actions__ENABLED=true
+      # All Gitea configuration is now in app.ini (deployed via Ansible)
+      # Environment variables removed for better reliability and maintainability
+      # Migration benefits:
+      # - Cache now works correctly (environment variables had a bug in Gitea 1.25)
+      # - All settings are versioned in Git
+      # - Better documentation and maintainability
     volumes:
       - gitea-data:/data
       - /etc/timezone:/etc/timezone:ro