Bugfix: agent docker connection issue, update wiki for Uber image (#638)

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## Description
Fix: agent docker connection issue, update wiki for Uber image 
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### Linked GitHub issue ID: #  

## Pull Request Checklist
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- [X] Tests for the changes have been added (for bug fixes / features)
- [X] Code compiles correctly with all tests are passed.
- [ ] I've read the [contributing
guide](https://github.com/microsoft/HydraLab/blob/main/CONTRIBUTING.md#making-changes-to-the-code)
and followed the recommended practices.
- [ ] [Wikis](https://github.com/microsoft/HydraLab/wiki) or
[README](https://github.com/microsoft/HydraLab/blob/main/README.md) have
been reviewed and added / updated if needed (for bug fixes / features)

### Does this introduce a breaking change?
*If this introduces a breaking change for Hydra Lab users, please
describe the impact and migration path.*

- [ ] Yes
- [ ] No

## How you tested it
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do local test and share the screenshots, etc.*


Please check the type of change your PR introduces:
- [X] Bugfix
- [ ] Feature
- [ ] Technical design
- [ ] Build related changes
- [ ] Refactoring (no functional changes, no api changes)
- [ ] Code style update (formatting, renaming) or Documentation content
changes
- [ ] Other (please describe): 

### Feature UI screenshots or Technical design diagrams
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the tech design with PlantUML and explaining why you chose the solution
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README.md

@@ -53,7 +53,13 @@ Hydra Lab offers an out-of-box experience of the Docker image, and we call it `U
 
 **Step 1. Download and install [Docker](https://www.docker.com)**
 
-**Step 2. Run on your machine**
+**Step 2. Download latest Uber Docker image**
+```bash
+docker pull ghcr.io/microsoft/hydra-lab-uber:latest
+```
+**This step is necessary.** Without this step and jump to step 3, you may target at the local cached Docker image with `latest` tag if it exists.
+
+**Step 3. Run on your machine**
 
 By Default, Hydra Lab will use the local file system as a storage solution, and you may type the following in your terminal to run it:
 

agent/src/main/resources/application-docker.yml

@@ -6,4 +6,6 @@ app:
   adb:
     # Official doc about this hostname: https://docs.docker.com/desktop/networking/#i-want-to-connect-from-a-container-to-a-service-on-the-host
     host: host.docker.internal
-    port: 5037
+    port: 5037
+  registry:
+    schema: "ws"