The command beam services run is not working for standalone microservices that doesn't have the following folder structure:

TestService/
----services/
----TestService/
----TestServiceCommon/
----TestService.sln

This seems to be because the DockerFile is trying to copy the Common project assuming it's a child of the services/ folder.

When running from Unity, we need to set the DockerBuildContextPath to the unity project root, and set the relative Dockerfile path be relative to the unity root.

"HttpMicroserviceLocalProtocols": {
    "EggSalad": {
      "DockerBuildContextPath": ".",
      "RelativeDockerfilePath": "Assets/Beamable/StandaloneMicroservices~/EggSalad/Dockerfile",
      "BindSrcForHotReloading": {
        "IsReadOnly": false,
        "LocalPath": null,
        "InContainerPath": null
      },
      "HotReloadEnabledEndpoint": null,
      "HotReloadEnabledPort": null,
      "CustomPortBindings": [],
      "CustomBindMounts": [],
      "CustomVolumes": [],
      "CustomEnvironmentVariables": [],
      "InstanceCount": 1
    },

The beamservice signpost file has the assetProjectPath field, which needs to map to the Unity project relative path of the service csproj file. Then, that path becomes the main source for the relative dockerfile path, and the build context path is always ., because Unity CLI .beamable contexts are always at the unity root.