feat: support secrets in render task definition

[kg-aws]

Issue #, if available:
#20
Description of changes:
NOTE: This PR is the follow up / rebased version of the PR: #152

Add ability to add secrets to task definition. There is already a pull request here #143 which tries to do this, but it isn't backward compatible. This pull request is. It also doesn't add tests which this PR does.

Thank you @yehudacohen and @hectorgrecco for the initial PR

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[amazreech]

Thanks Kishan, LGTM!

[kurarrr]

It would be appreciated if you could release this nice feature. Thanks in advance!

[Ma-hawaj]

I see that this feature is released but I'm having issues with it.
I'm using the following:

      - name: Fill in the new image ID in the Amazon ECS task definition
        id: task-def-dev
        uses: aws-actions/[email protected]
        with:
          task-definition-family: dev-chatbot-client-family
          container-name: dev-chatbot-client-container
          secrets: |
            BOT_API_KEY=arn:aws:secretsmanager:***
            BOT_URL=arn:aws:secretsmanager:***
            SUPPORT_CALLBACK_URL=arn:aws:secretsmanager:***
            TABLE_NAME=arn:aws:secretsmanager:***
            COGNITO_CLIENT_ID=arn:aws:secretsmanager:***
            AWS_REGION=arn:aws:secretsmanager:***
          image: '***'

      - name: Show task defenetion
        run: cat ${{ steps.task-def-dev.outputs.task-definition }}

but I'm getting the task definition without any secrets could any one help with that ?