Fix two issue in example

[cky008]

When using the current command, you will encounter the following error:

unknown flag: --platform
See 'docker buildx --help'.

This change will mitigate this issue

Reference: Deploying to ECR

Another change is due to following error:

[+] Building 2.0s (2/2) FINISHED                                                                                                                                                                                                              docker-container:cranky_black
 => [internal] booting buildkit                                                                                                                                                                                                                                        1.6s
 => => pulling image moby/buildkit:buildx-stable-1                                                                                                                                                                                                                     0.9s
 => => creating container buildx_buildkit_cranky_black0                                                                                                                                                                                                                0.7s
 => [internal] load build definition from Dockerfile                                                                                                                                                                                                                   0.0s
 => => transferring dockerfile: 480B                                                                                                                                                                                                                                   0.0s
Dockerfile:9
--------------------
   7 |     RUN npm install
   8 |     
   9 | >>> npm install typescript -g
  10 |     
  11 |     COPY . .
--------------------
ERROR: failed to solve: dockerfile parse error on line 9: unknown instruction: npm

Amazon Bedrock AgentCore Samples Pull Request

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Issue number:

Concise description of the PR

Changes to given cli command, because there is an issue with current cli command and Dockerfile

User experience

Please share what the user experience looks like before and after this change
Before:

After:

Another change:
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• I have reviewed the contributing guidelines
• Add your name to CONTRIBUTORS.md
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• [] Are you uploading a dataset?
• Have you documented Introduction, Architecture Diagram, Prerequisites, Usage, Sample Prompts, and Clean Up steps in your example README?
• I agree to resolve any issues created for this example in the future.
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• Changes have been tested
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[cky008]

fix #444

[cky008]

ready for review