ci: Replace Ubuntu 22.04 with 26.04 (#105)

Retire Ubuntu 22.04 CI builds and replace them with Ubuntu 26.04.

The ARM v7 CI build on Ubuntu 26.04 remains disabled for now.

Author: uklotzde

.github/workflows/test.yaml

@@ -38,23 +38,25 @@ jobs:
           - target: aarch64-apple-darwin
             runner_os: macos-26
 
-          - target: aarch64-unknown-linux-gnu
-            runner_os: ubuntu-22.04-arm
           - target: aarch64-unknown-linux-gnu
             runner_os: ubuntu-24.04-arm
+          - target: aarch64-unknown-linux-gnu
+            runner_os: ubuntu-26.04-arm
 
-          - target: aarch64-unknown-linux-musl
-            runner_os: ubuntu-22.04-arm
           - target: aarch64-unknown-linux-musl
             runner_os: ubuntu-24.04-arm
+          - target: aarch64-unknown-linux-musl
+            runner_os: ubuntu-26.04-arm
 
           - target: aarch64-pc-windows-msvc
             runner_os: windows-11-arm
 
-          - target: armv7-unknown-linux-gnueabihf
-            runner_os: ubuntu-22.04
           - target: armv7-unknown-linux-gnueabihf
             runner_os: ubuntu-24.04
+          # Build on Ubuntu 26.04 fails: <https://github.com/Mbed-TLS/mbedtls/issues/9875>
+          # TODO: Re-enable when fixed.
+          #- target: armv7-unknown-linux-gnueabihf
+          #  runner_os: ubuntu-26.04
 
           - target: x86_64-apple-darwin
             runner_os: macos-15-intel
@@ -66,15 +68,15 @@ jobs:
           - target: x86_64-pc-windows-msvc
             runner_os: windows-2025
 
-          - target: x86_64-unknown-linux-gnu
-            runner_os: ubuntu-22.04
           - target: x86_64-unknown-linux-gnu
             runner_os: ubuntu-24.04
+          - target: x86_64-unknown-linux-gnu
+            runner_os: ubuntu-26.04
 
-          - target: x86_64-unknown-linux-musl
-            runner_os: ubuntu-22.04
           - target: x86_64-unknown-linux-musl
             runner_os: ubuntu-24.04
+          - target: x86_64-unknown-linux-musl
+            runner_os: ubuntu-26.04
 
     runs-on: ${{ matrix.runner_os }}