chore: migrate images to Ubuntu 26.04 (resolute)

Author: matifali

README.md

@@ -23,13 +23,13 @@ under the `ubuntu` tag.
 
 Each image is published with the following tag variants:
 
-| Tag                       | Example                                       | Description                                        |
-| ------------------------- | --------------------------------------------- | -------------------------------------------------- |
-| `ubuntu`                  | `codercom/example-base:ubuntu`                | Latest Ubuntu version (rolling)                    |
-| `ubuntu-{version}`        | `codercom/example-base:ubuntu-noble`          | Pinned to a specific Ubuntu release                |
-| `ubuntu-{date}`           | `codercom/example-base:ubuntu-20250101`       | Snapshot from a specific build date                |
-| `ubuntu-{version}-{date}` | `codercom/example-base:ubuntu-noble-20250101` | Version-pinned snapshot from a specific build date |
-| `latest`                  | `codercom/example-base:latest`                | Alias for the latest build                         |
+| Tag                       | Example                                          | Description                                        |
+| ------------------------- | ------------------------------------------------ | -------------------------------------------------- |
+| `ubuntu`                  | `codercom/example-base:ubuntu`                   | Latest Ubuntu version (rolling)                    |
+| `ubuntu-{version}`        | `codercom/example-base:ubuntu-resolute`          | Pinned to a specific Ubuntu release                |
+| `ubuntu-{date}`           | `codercom/example-base:ubuntu-20250101`          | Snapshot from a specific build date                |
+| `ubuntu-{version}-{date}` | `codercom/example-base:ubuntu-resolute-20250101` | Version-pinned snapshot from a specific build date |
+| `latest`                  | `codercom/example-base:latest`                   | Alias for the latest build                         |
 
 > For backward compatibility, these images are also available with the `enterprise-` prefix
 > (e.g., `codercom/enterprise-base`), but the `example-` prefix is recommended for new deployments.

images/base/docker.list

@@ -1 +1 @@
-deb [signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu noble stable
+deb [signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu resolute stable

images/base/ubuntu.Dockerfile

@@ -1,4 +1,4 @@
-ARG UBUNTU_VERSION=noble
+ARG UBUNTU_VERSION=resolute
 FROM ubuntu:${UBUNTU_VERSION}
 
 SHELL ["/bin/bash", "-c"]

images/minimal/ubuntu.Dockerfile

@@ -1,4 +1,4 @@
-ARG UBUNTU_VERSION=noble
+ARG UBUNTU_VERSION=resolute
 FROM ubuntu:${UBUNTU_VERSION}
 
 USER root

images/universal/ubuntu.Dockerfile

@@ -1,5 +1,7 @@
-ARG UBUNTU_VERSION=noble
-FROM mcr.microsoft.com/devcontainers/universal:${UBUNTU_VERSION}
+# Pinned to noble because Microsoft's devcontainers/universal image does not
+# yet publish a resolute (26.04) tag. Re-couple this to the shared
+# UBUNTU_VERSION build arg once an upstream resolute tag is available.
+FROM mcr.microsoft.com/devcontainers/universal:noble
 
 USER root
 

scripts/images.sh

@@ -6,7 +6,7 @@ set -euo pipefail
 # images. Changing this value and rebuilding will produce images on
 # a different Ubuntu release. All Dockerfiles and the push script
 # read this variable so it acts as a single source of truth.
-UBUNTU_VERSION="noble"
+UBUNTU_VERSION="resolute"
 
 # IMAGES defines the list of images to build/push IN ORDER.
 IMAGES=(