feat(web): add local portfolio cover storage

compose.yaml

@@ -101,10 +101,12 @@ services:
       - "Discord__ClientId=${DISCORD_CLIENT_ID:-}"
       - "Discord__ClientSecret=${DISCORD_CLIENT_SECRET:-}"
       - "Discord__RedirectUri=${DISCORD_REDIRECT_URI:-}"
+      - "PortfolioCovers__StoragePath=/app/portfolio-covers"
     ports:
       - "${GMRELAY_WEB_PORT:-8080}:8080"
     volumes:
       - web_keys:/app/dataprotection-keys
+      - portfolio_covers:/app/portfolio-covers
     networks:
       - gmrelay
     healthcheck:
@@ -120,6 +122,8 @@ volumes:
     name: ${WEB_KEYS_VOLUME_NAME:-gmrelay_web_keys}
   pgbackups:
     name: ${BACKUP_VOLUME_NAME:-game_pgbackups}
+  portfolio_covers:
+    name: ${PORTFOLIO_COVERS_VOLUME_NAME:-gmrelay_portfolio_covers}
 
 networks:
   gmrelay: