security: harden data auth and deployment

docker-compose.beta.yml

@@ -15,6 +15,8 @@ services:
       AUTH_COOKIE_NAME: magent_beta_auth
       AUTH_STATE_COOKIE_NAME: magent_beta_logged_in
       AUTH_COOKIE_DOMAIN: beta.grizzlyflix.co.nz
+      AUTH_COOKIE_SECURE: "true"
+      AUTH_COOKIE_SAMESITE: strict
       SQLITE_PATH: /app/data/magent.db
       LOG_FILE: /app/data/magent.log
       SITE_BANNER_ENABLED: "true"
@@ -26,3 +28,10 @@ services:
     volumes:
       - ./data:/app/data
     restart: unless-stopped
+    read_only: true
+    cap_drop: ["ALL"]
+    security_opt: ["no-new-privileges:true"]
+    init: true
+    tmpfs:
+      - /tmp:rw,noexec,nosuid,size=64m,uid=1000,gid=1000
+      - /app/frontend/.next/cache:rw,noexec,nosuid,size=128m,uid=1000,gid=1000