ImagePullBackOff Error When Using GitHub Tutorial for Container Apps

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### This issue is for a: (mark with an `x`)
```
- [X ] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
- Follow the steps at https://learn.microsoft.com/en-us/azure/container-apps/dapr-github-actions?tabs=bash
- GitHub action should deploy everything successfully (successfully from a GitHub standpoint)
- `node-app` container app will provision initially but then fail due to error below

### Any log messages given by the failure
- Failed to pull image "ghcr.io/danwahlin/container-apps-store-api-microservice/node-service:sha-ac6a0a4": rpc error: code = Unknown desc = failed to pull and unpack image "ghcr.io/danwahlin/container-apps-store-api-microservice/node-service:sha-ac6a0a4": failed to resolve reference "ghcr.io/danwahlin/container-apps-store-api-microservice/node-service:sha-ac6a0a4": failed to authorize: failed to fetch oauth token: unexpected status: 403 Forbidden
- Error: ErrImagePull
- Liveness probe failed: HTTP probe failed with statuscode: 500

### Expected/desired behavior
> Container App should load the image and then run

### OS and Version?
> Mac Monterey 12.6

### Mention any other details that might be useful

I'm able to run `docker pull ghcr.io/danwahlin/container-apps-store-api-microservice/node-service:sha-ac6a0a4` successfully from my local machine. The node-app container app doesn't seem to be able to pull that image though. I see that the container app `Image type` is `Private` but the package is public in GitHub.

I changed `isPrivateRegistry` to `true` in `deploy/main.bicep` and it seems to work now. See PR #32.

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