Migrate service images to images-specialized repository

[ianpittwood]

Migrate the workbench-for-google-cloud-workstations and workbench-for-microsoft-azure-ml images to the new posit-dev/images-specialized repository and make the definitions and images publicly available to customers.

[ianpittwood]

• Convert WGCW and WAML images to Bakery templates (Add Workbench for Google Cloud Workstations image definition images-specialized#1, Add Workbench for Azure ML definition images-specialized#5)
• Update CI to match other images repositories
  • Add PR workflow (Align CI workflows with images-workbench images-specialized#8)
  • Add Dependabot and Zizmor gates (Align CI workflows with images-workbench images-specialized#8)
  • Add release workflow to ingest Workbench releases
• Create READMEs for repository and service images (Add repository READMEs, license, and contributor scaffolding images-specialized#10)
• Make repository and packages public
• Test latest releases of Workbench on GCW and AML (2026.01.2 was tested on GCW)
• Remove and redirect existing WAML and WGCW image definitions from rstudio-docker-products (see Move specialized Workbench images to posit-dev/images-specialized rstudio/rstudio-docker-products#1032)