chore: bump container tag

[matt-FFFFFF]

This pull request updates configuration variables related to container image builds for both Azure DevOps Agents and GitHub Runners. The main changes are to standardize the Dockerfile naming convention and update the default container image tag used across the deployment modules.

Container image configuration updates:

• Changed the default container image tag for both Azure DevOps Agents and GitHub Runners from "39b9059" to "57a937f" in alz/azuredevops/variables.tf and alz/github/variables.tf. [1] [2]
• Updated the default Dockerfile name from "dockerfile" to "Dockerfile" for agent, runner, and registry builds in alz/azuredevops/variables.tf, alz/github/variables.tf, and modules/azure/variables.tf. [1] [2] [3]

[jaredfholgate]

The container build is failing with this error:

[jaredfholgate]

We'll need to fix the dockerfile for this issue. Seems the update is not going to be as easy as hoped.

[matt-FFFFFF]

We'll need to fix the dockerfile for this issue. Seems the update is not going to be as easy as hoped.

I can sort this fairly easily. I'm surprised we need tools like netcat though! I'll add a workflow to the source repo to build the image to shift this left

[matt-FFFFFF]

Actually thinking about it I can see netcat being useful to stream output.. I'll take a look

[jaredfholgate]

LGTM