feat: switch base container to Ubuntu 26.04

.devcontainer/base/Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM ubuntu:24.04@sha256:cd1dba651b3080c3686ecf4e3c4220f026b521fb76978881737d24f200828b2b AS extractor
+FROM ubuntu:26.04@sha256:f3d28607ddd78734bb7f71f117f3c6706c666b8b76cbff7c9ff6e5718d46ff64 AS extractor
 
 ARG BATS_CORE_VERSION=1.13.0
 ARG BATS_SUPPORT_VERSION=0.3.0
@@ -20,10 +20,12 @@ RUN tar xzf /bats-core.tar.gz && mv bats-core-*/ bats-core \
  && tar xzf /bats-support.tar.gz && mv bats-support-*/ bats-support \
  && tar xzf /bats-assert.tar.gz && mv bats-assert-*/ bats-assert
 
-FROM ubuntu:24.04@sha256:cd1dba651b3080c3686ecf4e3c4220f026b521fb76978881737d24f200828b2b
+FROM ubuntu:26.04@sha256:f3d28607ddd78734bb7f71f117f3c6706c666b8b76cbff7c9ff6e5718d46ff64
 
 ARG DEBIAN_FRONTEND=noninteractive
 
+ENV LANG=C.UTF-8
+
 HEALTHCHECK NONE
 
 SHELL ["/bin/bash", "-Eeuo", "pipefail", "-c"]
@@ -49,8 +51,10 @@ RUN --mount=type=bind,source=.devcontainer/base/apt-requirements.json,target=/tm
    cp -r /src/bats-support /usr/local/bats-support
    cp -r /src/bats-assert /usr/local/bats-assert
 
-   # Update all tool alternatives to the correct version
-   # and patch root's bashrc to include bash-completion
-   update-alternatives --install /usr/bin/cc cc /usr/bin/gcc-14 20
+   # Generate locale
+   sed -i '/C.UTF-8/s/^# //' /etc/locale.gen
+   locale-gen
+
+   # Patch root's bashrc to include bash-completion
    cp /etc/skel/.bashrc /root/.bashrc
 EOF

.devcontainer/base/apt-requirements.json

@@ -1,10 +1,10 @@
 {
-  "bash-completion": "1:2.11-8",
-  "ca-certificates": "20240203",
-  "g++-14": "14.2.0-4ubuntu2~24.04.1",
-  "git": "1:2.43.0-1ubuntu7.3",
-  "gnupg2": "2.4.4-2ubuntu17.4",
-  "udev": "255.4-1ubuntu8.15",
-  "wget": "1.21.4-1ubuntu4.1",
-  "xz-utils": "5.6.1+really5.4.5-1ubuntu0.2"
+  "bash-completion": "1:2.16.0-8build1",
+  "ca-certificates": "20260223",
+  "git": "1:2.53.0-1ubuntu1",
+  "gnupg2": "2.4.8-4ubuntu3",
+  "locales": "2.43-2ubuntu2",
+  "udev": "259.5-0ubuntu3",
+  "wget": "1.25.0-2ubuntu4",
+  "xz-utils": "5.8.3-1"
 }

.devcontainer/cpp/Dockerfile

@@ -61,13 +61,13 @@ RUN --mount=from=downloader,target=/dl \
     --mount=type=cache,target=/var/lib/apt,sharing=locked <<EOF
     apt-get update && apt-get install --no-install-recommends -y minisign
 
-    ARM_GNU_TOOLCHAIN_URL="https://developer.arm.com/-/media/Files/downloads/gnu/14.2.rel1/binrel/arm-gnu-toolchain-14.2.rel1-$(uname -m)-arm-none-eabi.tar.xz"
+    ARM_GNU_TOOLCHAIN_URL="https://developer.arm.com/-/media/Files/downloads/gnu/15.2.rel1/binrel/arm-gnu-toolchain-15.2.rel1-$(uname -m)-arm-none-eabi.tar.xz"
     ARM_GNU_TOOLCHAIN_TAR="/tmp/arm-gnu-toolchain.tar.xz"
 
     if [[ "$(uname -m)" == "x86_64" ]]; then
-        ARM_GNU_TOOLCHAIN_SHA256="62a63b981fe391a9cbad7ef51b17e49aeaa3e7b0d029b36ca1e9c3b2a9b78823"
+        ARM_GNU_TOOLCHAIN_SHA256="597893282ac8c6ab1a4073977f2362990184599643b4c5ee34870a8215783a16"
     elif [[ "$(uname -m)" == "aarch64" ]]; then
-        ARM_GNU_TOOLCHAIN_SHA256="87330bab085dd8749d4ed0ad633674b9dc48b237b61069e3b481abd364d0a684"
+        ARM_GNU_TOOLCHAIN_SHA256="d061559d814b205ed30c5b7c577c03317ec447ca51cd5a159d26b12a5bbeb20c"
     fi
 
     wget --no-hsts -qO "${ARM_GNU_TOOLCHAIN_TAR}" "${ARM_GNU_TOOLCHAIN_URL}"
@@ -132,7 +132,7 @@ RUN --mount=type=bind,source=.devcontainer/cpp/apt-requirements-base.json,target
     cat /src/mull.gpg.key | gpg --dearmor -o /usr/share/keyrings/mull-project-mull-stable-archive-keyring.gpg
 
     UBUNTU_CODENAME=$(grep '^UBUNTU_CODENAME=' /etc/os-release | cut -d= -f2)
-    echo "deb [signed-by=/usr/share/keyrings/llvm-snapshot-keyring.gpg] http://apt.llvm.org/${UBUNTU_CODENAME}/ llvm-toolchain-${UBUNTU_CODENAME}-${CLANG_VERSION} main" | tee /etc/apt/sources.list.d/llvm-snapshot.list > /dev/null
+    #echo "deb [signed-by=/usr/share/keyrings/llvm-snapshot-keyring.gpg] http://apt.llvm.org/${UBUNTU_CODENAME}/ llvm-toolchain-${UBUNTU_CODENAME}-${CLANG_VERSION} main" | tee /etc/apt/sources.list.d/llvm-snapshot.list > /dev/null
     echo "deb [signed-by=/usr/share/keyrings/mull-project-mull-stable-archive-keyring.gpg] https://dl.cloudsmith.io/public/mull-project/mull-stable/deb/ubuntu ${UBUNTU_CODENAME} main" | tee /etc/apt/sources.list.d/mull-project-mull-stable.list > /dev/null
     echo -e 'Package: *\nPin: origin "apt.llvm.org"\nPin-Priority: 1000' > /etc/apt/preferences
     apt-get update && jq -r 'to_entries | .[] | .key + "=" + .value' /tmp/apt-requirements-clang.json | \
@@ -159,11 +159,11 @@ RUN --mount=type=cache,target=/cache,sharing=locked \
 # Update all tool alternatives to the correct version
 # and patch root's bashrc to include bash-completion
 RUN --mount=type=cache,target=/var/log,sharing=locked \
- update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-14 10 \
-                        --slave /usr/bin/g++ g++ /usr/bin/g++-14 \
-                        --slave /usr/bin/gcov gcov /usr/bin/gcov-14 \
- && update-alternatives --install /usr/bin/cc cc /usr/bin/gcc-14 10 \
-                        --slave /usr/bin/c++ c++ /usr/bin/g++-14 \
+ update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-15 10 \
+                        --slave /usr/bin/g++ g++ /usr/bin/g++-15 \
+                        --slave /usr/bin/gcov gcov /usr/bin/gcov-15 \
+ && update-alternatives --install /usr/bin/cc cc /usr/bin/gcc-15 10 \
+                        --slave /usr/bin/c++ c++ /usr/bin/g++-15 \
  && update-alternatives --install /usr/bin/iwyu iwyu /usr/local/bin/include-what-you-use 10 \
  && update-alternatives --install /usr/bin/mull-runner mull-runner /usr/bin/mull-runner-${CLANG_VERSION} 10 \
                         --slave /usr/bin/mull-reporter mull-reporter /usr/bin/mull-reporter-${CLANG_VERSION} \

.devcontainer/cpp/apt-requirements-base.json

@@ -1,7 +1,7 @@
 {
-  "gdb-multiarch": "15.1-1ubuntu1~24.04.1",
-  "ninja-build": "1.11.1-2",
-  "python3-pip": "24.0+dfsg-1ubuntu1.3",
-  "unzip": "6.0-28ubuntu4.1",
-  "xsltproc": "1.1.39-0exp1ubuntu0.24.04.3"
+  "g++-15": "15.2.0-16ubuntu1",
+  "gdb-multiarch": "17.1-2ubuntu1",
+  "ninja-build": "1.13.2-1",
+  "python3-pip": "25.1.1+dfsg-1ubuntu2",
+  "unzip": "6.0-29ubuntu1"
 }

.devcontainer/cpp/apt-requirements-clang.json

@@ -1,11 +1,11 @@
 {
-  "clang-20": "1:20.1.8~++20250804090239+87f0227cb601-1~exp1~20250804210352.139",
-  "clangd-20": "1:20.1.8~++20250804090239+87f0227cb601-1~exp1~20250804210352.139",
-  "clang-format-20": "1:20.1.8~++20250804090239+87f0227cb601-1~exp1~20250804210352.139",
-  "clang-tidy-20": "1:20.1.8~++20250804090239+87f0227cb601-1~exp1~20250804210352.139",
-  "clang-tools-20": "1:20.1.8~++20250804090239+87f0227cb601-1~exp1~20250804210352.139",
-  "libclang-rt-20-dev": "1:20.1.8~++20250804090239+87f0227cb601-1~exp1~20250804210352.139",
-  "lld-20": "1:20.1.8~++20250804090239+87f0227cb601-1~exp1~20250804210352.139",
-  "llvm-20": "1:20.1.8~++20250804090239+87f0227cb601-1~exp1~20250804210352.139",
+  "clang-20": "1:20.1.8-2ubuntu8",
+  "clangd-20": "1:20.1.8-2ubuntu8",
+  "clang-format-20": "1:20.1.8-2ubuntu8",
+  "clang-tidy-20": "1:20.1.8-2ubuntu8",
+  "clang-tools-20": "1:20.1.8-2ubuntu8",
+  "libclang-rt-20-dev": "1:20.1.8-2ubuntu8",
+  "lld-20": "1:20.1.8-2ubuntu8",
+  "llvm-20": "1:20.1.8-2ubuntu8",
   "mull-20": "0.33.0"
 }