Add Ubuntu 26.04 (resolute) support

[bschwedler]

Ubuntu 26.04 LTS (Resolute Raccoon) was released April 23, 2026. This issue tracks adding support across all product image repos.

Workaround for missing apt packages

Posit product packages are not yet published to the Cloudsmith apt repository for resolute. The templates use the codename parameter on apt.run_setup() to pass codename=noble as an environment variable to the Cloudsmith setup script, which natively supports overriding OS detection. The noble .deb packages install on resolute without issues. Once packages are published for resolute, the codename parameter should be removed from each template.

PRs

• Add Ubuntu 26.04 support to bakery #494
• Add Ubuntu 26.04 support images-connect#73
• Add Ubuntu 26.04 support images-workbench#85
• Add Ubuntu 26.04 support images-package-manager#76

Merge order

1. images-shared#494 first -- adds Ubuntu 26.04 to SUPPORTED_OS and the codename macro parameter that all downstream templates depend on
2. Product repos (connect, workbench, package-manager) in any order after images-shared merges. Package-manager depends on its goss-system-packages base branch merging first.

Remaining work

• Verify the ubuntu:26.04 base image is available on Docker Hub
• Test a dev build end-to-end for each product on Ubuntu 26.04
• Validate that noble Pro Drivers (rstudio-drivers) install and function correctly on resolute
• Verify P3M binary packages resolve correctly for the resolute codename (if not, may need to fall back to noble until P3M adds resolute support)
• Update ubuntu-26.04_packages.txt dep files if any package names changed between noble and resolute
• Re-render version directories with bakery update files after merging
• Remove codename="noble" once Posit publishes resolute packages to Cloudsmith
• Add Ubuntu 26.04 to release versions once validated in dev

[bschwedler]

Development versions need to be available from products.