Update CI/CD pipelines to support multiple environments

[julie-ng]

Now that the project is configured to target two environments (production and dev), we need to update the CI/CD pipelines accordingly.

[julie-ng]

Pull Request Target Branch Variable

System.PullRequest.TargetBranch is only available if there is a git branch protection policy applied to that target branch

I read the Predefined Variables documentation too quickly 🤦‍♀️

System.PullRequest.TargetBranch
The branch that is the target of a pull request. For example: refs/heads/master when your repository is in Azure Repos and master when your repository is in GitHub. This variable is initialized only if the build ran because of a Git PR affected by a branch policy. This variable is only available in a YAML pipeline if the PR is affected by a branch policy.

[azure-pipelines]

⚠️  Configuration Drift Detected

Source Version: b8c209e

Approving this Pull Request may result in destructive changes to your Azure resources. Please review the terraform plan output diff at Azure Pipelines Build Result Page.

Proceed with caution!

[azure-pipelines]

🟢  No configuration drift detected

Source Version: 3c493a1

[azure-pipelines]

⚠️  Configuration Drift Detected

Source Version: fcc3ef8

Approving this Pull Request may result in destructive changes to your Azure resources. Please review the terraform plan output diff at Azure Pipelines Build Result Page.

Proceed with caution!

[azure-pipelines]

⚠️  Configuration Drift Detected (OR State File Locked)

Source Version: 0198626

Approving this Pull Request may result in destructive changes to your Azure resources. Please review the terraform plan output diff at Azure Pipelines Build Result Page.

Proceed with caution!

[azure-pipelines]

🟢  No configuration drift detected

Source Version: 3a70439