fix: generate database ID earlier and pull Docker image before container run

[tsivaprasad]

This PR includes two bug fixes:

Database ID generation:

• Moved the generation of DatabaseID earlier in the flow (before ValidateSpec) to avoid validation errors when the ID is missing.

Docker image availability:

• Added logic in ContainerRun to ensure the Docker image is pulled before attempting to create the container. This prevents failures due to missing local images.

Validation:

• Created a database without an ID using:

restish control-plane-local-1 create-database < No_ID_createdatabase.json

• Successfully created the database by assigning a newly generated ID.

• Deleted the pgedge Docker image from local images, then created a database without an ID.

• Volume validation was successful, and the database was created.

• Observed that the database was created with a newly generated random ID.

• Created a database with an ID using:

restish control-plane-local-1 create-database < createdatabase.json

• Successfully created the database with the specified ID.

restish control-plane-local-1 list-databases

HTTP/1.1 200 OK
Content-Length: 1646
Content-Type: application/json
Date: Fri, 13 Jun 2025 12:09:52 GMT

[
  {
    created_at: "2025-06-13T12:06:20Z"
    id: "0603d9cd-df2f-42ad-b945-2bc4b73fa461"
    instances: [
      {
        host_id: "8f6e5455-e228-4e2e-9129-a86cba1437c8"
        id: "badffb5e-c902-5167-b33b-173090dc77b2"
        node_name: "n1"
        state: "available"
      }
      {
        host_id: "36dcd7ff-9f04-476e-ac6f-5495d075607d"
        id: "774da19c-6185-599d-8ffd-de8014703dc8"
        node_name: "n2"
        state: "available"
      }
      {
        host_id: "fa461a39-5867-4a72-9923-dd7ce91e1eab"
        id: "c1a27534-b159-577b-822c-3f6d774b3c4d"
        node_name: "n3"
        state: "available"
      }
    ]
    state: "available"
    updated_at: "2025-06-13T12:06:20Z"
  }
  {
    created_at: "2025-06-13T11:31:25Z"
    id: "a7fa3516-d609-4779-ae12-3481b66e0d3b"
    instances: [
      {
        host_id: "8f6e5455-e228-4e2e-9129-a86cba1437c8"
        id: "f5980592-c75a-56a7-9bb6-2d19fcaf3651"
        node_name: "n1"
        state: "available"
      }
      {
        host_id: "36dcd7ff-9f04-476e-ac6f-5495d075607d"
        id: "36e0d876-e3f1-5c80-8154-d317f8a2e79d"
        node_name: "n2"
        state: "available"
      }
      {
        host_id: "fa461a39-5867-4a72-9923-dd7ce91e1eab"
        id: "759a5f06-d387-59f5-88ba-e885fc5811ab"
        node_name: "n3"
        state: "available"
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    ]
    state: "available"
    updated_at: "2025-06-13T11:31:25Z"
  }
  {
    created_at: "2025-06-13T12:09:03Z"
    id: "f2f1cae9-6f37-4609-aa98-d0991bff3493"
    instances: [
      {
        host_id: "8f6e5455-e228-4e2e-9129-a86cba1437c8"
        id: "60cff14d-066d-579c-b139-522d35f69d08"
        node_name: "n1"
        state: "available"
      }
      {
        host_id: "36dcd7ff-9f04-476e-ac6f-5495d075607d"
        id: "1de81ed2-aac1-5074-a221-681fdff0735d"
        node_name: "n2"
        state: "available"
      }
      {
        host_id: "fa461a39-5867-4a72-9923-dd7ce91e1eab"
        id: "73e3ab53-65b4-5a12-a73c-01c9df80af73"
        node_name: "n3"
        state: "available"
      }
    ]
    state: "available"
    updated_at: "2025-06-13T12:09:03Z"
  }
]

PLAT-115