Creation of AWSTemporaryCredentials to help with OIDC Federation via AssumeRoleWithWebIdentity

[ROunofF]

Description

Create a new task AWSTemporaryCredentials that use the OIDC token to federate and get temporary AWS Credentials from STS service.

Motivation

This aligns with the security best practices of not storing static credential. Adding a task this way, allows it to be flexible and even reusable across non-aws tasks.

Related Issue(s), If Filed

#521 PR #550 is taking a different approach but would need all tasks to be modified

Testing

Checklist

• [X] I have read the README document
• [X] I have read the CONTRIBUTING document
• [X] My code follows the code style of this project
• [X] I have added tests to cover my changes
• [X] A short description of the change has been added to the changelog using the script npm run newChange

License

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

[ROunofF]

Example pipeline, you add the AWSTemporaryCredentials first and the credentials are available in subsequent tasks, including non AWS tasks (see the Bash task for how to import the variable)

This could probably be added in the README?

steps:
    - task: AWSTemporaryCredentials@1
      displayName: 'Getting STS Credentials'
      inputs:
          azureSubscription: 'azuredo-poc'
          regionName: 'ca-central-1'
          assumeRole: arn:aws:iam:: 012345678901:role/azdo-s3-read

    - task: AWSShellScript@1
      displayName: 'AWS Shell script no awsCredentials'
      continueOnError: true
      inputs:
          regionName: 'ca-central-1'
          scriptType: inline
          inlineScript: |
              export
              aws sts get-caller-identity
              aws s3 ls
    - script: sudo apt-get install -y awscli
      displayName: Install AWS CLI # making sure we have the aws-cli for the non-aws task
    - task: Bash@3
      displayName: 'Using bash script task with regular export'
      continueOnError: true
      inputs:
          targetType: 'inline'
          script: |
              export AWS_ACCESS_KEY_ID=$(AWS.ACCESS_KEY_ID)
              export AWS_SECRET_ACCESS_KEY=$(AWS.SECRET_ACCESS_KEY)
              export AWS_SESSION_TOKEN=$(AWS.SESSION_TOKEN)
              aws s3 ls --region ca-central-1
    - task: AWSCLI@1
      displayName: 'via AWSCLI: Running aws-cli get-caller-identity '
      continueOnError: true
      inputs:
          regionName: 'ca-central-1'
          awsCommand: 'sts'
          awsSubCommand: 'get-caller-identity'

[rbbarad]

/retryBuild

[ROunofF]

Closing in favor of #558