added &> /dev/null to azdo dockerfile

[ImadKirat]

Purpose

I faced an issue when calling this script in Terraform using the local-exec provisioner where some of the output of the 4th step could not be parsed due to a missing encoding setting in Terraform.

The only thing i changed is redirecting the output of this step to /dev/null. As such, the output of the 4th step when calling this in a script does not go trough terraform (or anything really) so no parsing issues can occur.

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[X] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

• Test the code
  Run the following command
  az acr build --registry "{registery_name}" --image "azure-pipelines-agent:1.0" --file "Dockerfile.azure-pipelines" "https://github.com/Azure-Samples/container-apps-ci-cd-runner-tutorial.git"

What to Check

No output from the 4the step

Other Information

Below you can find the way I call the dockerfile in Terraform. It invokes the command but the output is going trough Terraform which causes the following error.
UnicodeEncodeError: 'charmap' codec can't encode character '\u2192' in position 3169: character maps to

As you can see, there is a parsing error due to the nature of the output from the dockerfile. Thats why supressing the output of the buildstep is a quick fix for this issue.

Another way to fix this would be to add the encoding="utf-8" in the function that is being used to invoke this command. But that would be on a change on the Terraform side.

Feel free to provide feedback or discuss this further.

resource "null_resource" "create_image" {
for_each = { for k, v in var.container_registries : k => v }
provisioner "local-exec" {
command = "az acr build --no-format --registry ${module.container_registry[each.key].data.name} --image azure-pipelines-agent:1.0 --file Dockerfile.azure-pipelines https://github.com/Azure-Samples/container-apps-ci-cd-runner-tutorial.git"
}
}