Migrate Linux CI to GCC 12

Dockerfile

@@ -45,6 +45,7 @@ RUN apt-get update \
   tzdata \
   jq \
   && if [ "$(. /etc/lsb-release; echo "${DISTRIB_RELEASE}" | cut -d. -f1)" -ge 22 ]; then apt-get install -y --no-install-recommends skopeo; fi \
+  && if [ "$(. /etc/lsb-release; echo "${DISTRIB_RELEASE}" | cut -d. -f1)" -eq 22 ]; then apt-get install -y --no-install-recommends g++-12; fi \
   && mkdir -p /etc/apt/keyrings \
   && chmod 0755 /etc /etc/apt /etc/apt/keyrings \
   && curl -fsSL https://cli.github.com/packages/githubcli-archive-keyring.gpg | tee /etc/apt/keyrings/githubcli-archive-keyring.gpg >/dev/null \

Library/Homebrew/os.rb

@@ -49,9 +49,9 @@ module OS
   LINUX_CI_OS_VERSION = "Ubuntu 22.04"
   LINUX_GLIBC_CI_VERSION = "2.35"
   LINUX_GLIBC_NEXT_CI_VERSION = "2.39"
-  LINUX_GCC_CI_VERSION = "11.0"
+  LINUX_GCC_CI_VERSION = "12" # https://packages.ubuntu.com/jammy/gcc-12
   LINUX_LIBSTDCXX_CI_VERSION = "6.0.30" # https://packages.ubuntu.com/jammy/libstdc++6
-  LINUX_PREFERRED_GCC_COMPILER_FORMULA = "gcc@11" # https://packages.ubuntu.com/jammy/gcc
+  LINUX_PREFERRED_GCC_COMPILER_FORMULA = T.let("gcc@#{LINUX_GCC_CI_VERSION}".freeze, String)
   LINUX_PREFERRED_GCC_RUNTIME_FORMULA = "gcc"
 
   if OS.mac?