无法连接Google Cloud Run中PostgreSQL边车容器的求助

我尝试在Google Cloud Run中运行Invidious Web容器，使其与PostgreSQL边车容器通信，以下是我的服务YAML配置片段：

spec:
      containerConcurrency: 80
      timeoutSeconds: 300
      serviceAccountName: 328305070564-compute@developer.gserviceaccount.com
      containers:
      - name: invidious-1
        image: ceramicwhite/invidious:build-3450896@sha256:4b90f6123c14a140c0c5aa39fbb1b49e520832b68a2d5606e11062592b7015cd
        ports:
        - name: http1
          containerPort: 3000
        env:
        - name: INVIDIOUS_CONFIG
          value: |
            db:
              dbname: db-name
              user: my-username
              password: super-secret
              host: localhost
              port: 5432
            check_tables: true
            external_port: 3000
            captcha_enabled: false
            admins: ["umbrel"]
            default_user_preferences:
              feed_menu: ["Trending", "Subscriptions", "Playlists"]
              default_home: Trending
            hmac_key: "${APP_SEED}"
        resources:
          limits:
            cpu: 1000m
            memory: 512Mi
        startupProbe:
          timeoutSeconds: 240
          periodSeconds: 240
          failureThreshold: 1
          tcpSocket:
            port: 3000
      - name: postgres1
        image: postgres:13.7@sha256:03652c675ae177af98ddd50f9f4b4b2cf8ad38d0e116aa68fe670fbc2cf250fc
        env:
        - name: POSTGRES_DB
          value: db-name
        - name: POSTGRES_USER
          value: my-username
        - name: POSTGRES_PASSWORD
          value: super-secret
        resources:
          limits:
            cpu: 1000m
            memory: 1Gi
        volumeMounts:
        - name: in-memory-1
          mountPath: /var/lib/postgresql/data/
      volumes:
      - name: in-memory-1
        emptyDir:
          medium: Memory
          sizeLimit: 2G
  traffic:
  - percent: 100
    latestRevision: true

根据配置及官方文档，预期Invidious容器可通过localhost:5432连接PostgreSQL容器，但容器启动失败，报错如下：

{
  "textPayload": "Caused by: Error connecting to 'localhost:5432': Connection refused (Socket::ConnectError)",
  "insertId": "6567d327000e76387751e45a",
  "resource": {
    "type": "cloud_run_revision",
    "labels": {
      "project_id": "complete-agency-406616",
      "service_name": "invidious",
      "location": "us-central1",
      "revision_name": "invidious-00017-zms",
      "configuration_name": "invidious"
    }
  },
  "timestamp": "2023-11-30T00:11:19.947768Z",
  "labels": {
    "container_name": "invidious-1",
    "instanceId": "0087599d428e073fef5c3ed8cac751f0df4ddf6710c3884e7ba9212319f7d82d07ac9ef1b0ccb73104a618d398bdb8135c6cf22faba200e7dcea2130a6f14f90eea2e64c"
  },
  "logName": "projects/complete-agency-406616/logs/run.googleapis.com%2Fstderr",
  "receiveTimestamp": "2023-11-30T00:11:19.975329453Z"
}

我还尝试使用127.0.0.1、postgres1替代localhost，均出现相同的连接失败问题。

请问在不搭建付费VPC的情况下，如何从入口容器访问边车容器？

内容的提问来源于stack exchange，提问作者johncorser