Configure Redis memory limit and eviction policy

Create redis.conf with maxmemory=512mb and allkeys-lru eviction. Mount
into Redis container and start with redis-server /etc/redis/redis.conf.
Prevents Redis OOM from SQL Lab query spikes killing the Celery broker.

Closes #78

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: szachovy

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Dependabot updates for `github-actions` and `terraform` ecosystems. (#29)
 * CI workflow to build and push service images to GitHub Container Registry on master merge. (#97)
 * Pull-first with local build fallback for container images during deployment. (#97)
+* Redis memory limit (512MB) and LRU eviction policy via redis.conf. (#78)
 
 ### Changed
 

services/superset/redis.conf

@@ -0,0 +1,4 @@
+maxmemory 512mb
+maxmemory-policy allkeys-lru
+tcp-backlog 511
+timeout 300

src/container.py

@@ -394,11 +394,18 @@ def run(self) -> None:
                 self.create_network()
                 self.client.containers.run(
                     "redis",
+                    command=["redis-server", "/etc/redis/redis.conf"],
                     detach=True,
                     restart_policy={"Name": "always"},
                     name="redis",
                     hostname="redis",
                     network="superset-network",
+                    volumes={
+                        "/opt/superset-cluster/superset/redis.conf": {
+                            "bind": "/etc/redis/redis.conf",
+                            "mode": "ro"
+                        }
+                    },
                     healthcheck={
                         'test': ["CMD", "redis-cli", "ping"],
                         'interval': self.healthcheck_interval * 1000000000,