Add Docker container runner to techdocs-node

[vinzscam]

Hey, I just made a Pull Request!

Since we are moving away from @backstage/backend-common this PR moves DockerContainerRunner to techdocs-node. Related to #24549

:heavy_check_mark: Checklist

• [x] A changeset describing the change and affected packages. (more info)
• [ ] Added or updated documentation
• [x] Tests for new functionality and regression tests for bug fixes
• [ ] Screenshots attached (for UI changes)
• [x] All your commits have a Signed-off-by line in the message. (more info)

[backstage-goalie[bot]]

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
example-backend	packages/backend	none	v0.2.98-next.1
@backstage/create-app	packages/create-app	patch	v0.5.15-next.1
@techdocs/cli	packages/techdocs-cli	patch	v1.8.11-next.1
@backstage/plugin-techdocs-backend	plugins/techdocs-backend	patch	v1.10.5-next.1
@backstage/plugin-techdocs-node	plugins/techdocs-node	patch	v1.12.4-next.1

[github-actions[bot]]

Uffizzi Ephemeral Environment - Virtual Cluster

Your cluster pr-24593 was successfully created. Learn more about Uffizzi virtual clusters To connect to this cluster, follow these steps:

1. Download and install the Uffizzi CLI from https://docs.uffizzi.com/install
2. Login to Uffizzi, then select the backstage account and project:

   uffizzi login

Select an account: 
  ‣ backstage
    jdoe

Select a project or create a new project: 
  ‣ backstage-6783521

3. Update your kubeconfig: uffizzi cluster update-kubeconfig pr-24593 --kubeconfig=[PATH_TO_KUBECONFIG] After updating your kubeconfig, you can manage your cluster with kubectl, kustomize, helm, and other tools that use kubeconfig files: kubectl get namespace --kubeconfig [PATH_TO_KUBECONFIG]

Access the backstage endpoint at https://backstage-default-pr-24593-c5359.uclusters.app.uffizzi.com