Using VSCode DevContainers with Dapr - Can't run Dapr Init within postStartCommand because Docker Runtime is not available

I am trying to setup a DevContainer for Dapr to make dev environment setup easy. I would like to run Dapr Init automatically so that there are no manual steps needed to run services.

I put "dapr init" in the postStartCommand, but when it runs it says there is no Docker Runtime available.

❌  could not connect to docker. docker may not be installed or running

Immediately after that fails, I can manually run "dapr init" in a terminal and it works appropriately.

I have tried giving it more time by adding a "sleep 30", but that doesn't seem to help.

Is there anything I can do to ensure the docker runtime is up and running so I can automatically initialize dapr?

Here is my devcontainer definition

{
  "name": "Dapr Quickstarts Codespace",
  "dockerFile": "Dockerfile",
  "customizations": {
    "vscode": {
      "extensions": [
        "golang.go",
        "ms-azuretools.vscode-dapr",
        "ms-azuretools.vscode-docker",
        "ms-kubernetes-tools.vscode-kubernetes-tools",
        "ms-dotnettools.csdevkit"
      ]
    }
  },
  "features": {
    "ghcr.io/dapr/cli/dapr-cli:0": {},
    "ghcr.io/devcontainers/features/docker-in-docker:2": {}
    },
  "mounts": [
    // Mount docker-in-docker library volume
    "source=codespaces-linux-var-lib-docker,target=/var/lib/docker,type=volume"
  ],
  "postStartCommand": "dapr init",
  // Always run image-defined docker-init.sh to enable docker-in-docker
  "overrideCommand": false,
  "remoteUser": "codespace",
  "runArgs": [
    // Enable ptrace-based debugging for Go in container
    "--cap-add=SYS_PTRACE",
    "--security-opt",
    "seccomp=unconfined",

    // Enable docker-in-docker configuration
    "--init",
    "--privileged"
  ]
}