Adapt to Debian 12 (bookworm) EOL transition to LTS on 2026-06-10

[MikeMcC399]

Situation

Debian distro parameters

According to https://wiki.debian.org/DebianReleases the milestones for bookworm (Debian 12) are:

Milestone	Date
Release	2023-06-10
End of life date	2026-06-10
End of life LTS	2028-06-30

Supported architectures of Debian 12.0 at release on 2023-06-10 were:

32-bit PC (i386) and 64-bit PC (amd64),
64-bit ARM (arm64),
ARM EABI (armel),
ARMv7 (EABI hard-float ABI, armhf),
little-endian MIPS (mipsel),
64-bit little-endian MIPS (mips64el),
64-bit little-endian PowerPC (ppc64el),
IBM System z (s390x)

After end-of-life transition on 2026-06-10 into bookworm LTS support status, the supported architectures are reduced to:

i386, amd64, arm64, armhf and ppc64el

Docker node usage

versions.json defines usage as:

      "bookworm": [
        "amd64",
        "arm64v8",
        "ppc64le",
        "s390x"
      ],
      "bookworm-slim": [
        "amd64",
        "arm64v8",
        "ppc64le",
        "s390x"
      ],

Change needed

The s390x architecture variant for bookworm is no longer supported after 2026-06-10 and this date has already been reached.

s390x for bookworm needs to be removed from the configuration.