Add support for raw bicep strings

[eerhardt]

We'd like to be able to generate bicep that looks like this:

https://github.com/Azure/karpenter-provider-azure/blob/2eee84b6583ec486bf13ace5c4ba49cefec941b0/hack/infra/ksnap-acr.bicep#L19-L39

var purgeOldArtifacts = '''
version: v1.1.0
steps:
- cmd: acr purge --filter 'karpenter/snapshot/.*:.*' --ago 30d
  disableWorkingDirectoryOverride: true
  timeout: 3600
'''


@description('purge old artifacts from the registry periodically')
resource acrPurgeTask 'Microsoft.ContainerRegistry/registries/tasks@2019-06-01-preview' = {
  name: 'purge-old-artifacts'
  location: location
  parent: acr
  properties: {
    platform: {
      os: 'Linux'
      architecture: 'amd64'
    }
    step: {
      type: 'EncodedTask'
      encodedTaskContent: base64(purgeOldArtifacts)

In order to make the bicep readable. But Azure.Provisioning doesn't support having multi-line string variable like this.

cc @ArcturusZhang

[ArcturusZhang]

To make the issue more clear, this is a feature request to support multi-line string literals in Azure.Provisioning library, like in the code snippet we have, the assignment of variable purgeOldArtifacts, and it produces the bicep like this:

var purgeOldArtifacts = '''
version: v1.1.0
steps:
- cmd: acr purge --filter 'karpenter/snapshot/.*:.*' --ago 30d
  disableWorkingDirectoryOverride: true
  timeout: 3600
'''

is this correct?

[eerhardt]

To make the issue more clear, this is a feature request to support multi-line string literals in Azure.Provisioning library, like in the code snippet we have, the assignment of variable purgeOldArtifacts, and it produces the bicep like this:

var purgeOldArtifacts = '''
version: v1.1.0
steps:
- cmd: acr purge --filter 'karpenter/snapshot/.*:.*' --ago 30d
  disableWorkingDirectoryOverride: true
  timeout: 3600
'''

is this correct?

Correct.