Remediate EOL and approaching-EOL OS references in pipelines

[richlander]

An audit of OS references across main and active release branches found several pipeline files referencing OS versions that are EOL or approaching EOL.

See OS onboarding guide for context. Part of .NET OS Support Tracking.

Tracking

EOL — fix now

• main — openSUSE 15.5 → 16.0 (helix)
• release/8.0 — Ubuntu 20.04 → 22.04 (build image)

Approaching EOL — fix within 3 months

• main — Fedora 42 (EOL 2026-05-13) → 43 (helix)
• main — Debian 12 (EOL 2026-06-10) → 13 (helix)
• release/9.0 — Debian 12 (EOL 2026-06-10) → 13 (helix)
• release/8.0 — Debian 12 (EOL 2026-06-10) → 13 (helix + build image)

Cleanup

• release/9.0 — Alpine 3.21 → 3.23 (build image; 3.23 already present for helix)

Details

main — openSUSE 15.5 (EOL)

runtime/eng/pipelines/helix-platforms.yml

Line 139 in c31475e

value: (openSUSE.15.5.Amd64.Open)AzureLinux.3.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:opensuse-15.5-helix-amd64

main — Fedora 42 (EOL 2026-05-13)

runtime/eng/pipelines/helix-platforms.yml

Line 130 in c31475e

value: (Fedora.42.Amd64.Open)AzureLinux.3.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-42-helix-amd64

main — Debian 12 (EOL 2026-06-10)

runtime/eng/pipelines/helix-platforms.yml

Line 121 in c31475e

value: (Debian.12.Amd64.Open)AzureLinux.3.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-12-helix-amd64

runtime/eng/pipelines/helix-platforms.yml

Lines 158 to 163 in c31475e

	# Oldest: Debian 12
	- name: helix_linux_arm32_oldest
	value: (Debian.12.Arm32.Open)Ubuntu.2204.ArmArch.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-12-helix-arm32v7
	- name: helix_linux_arm32_oldest_internal
	value: (Debian.12.Arm32)Ubuntu.2204.ArmArch@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-12-helix-arm32v7

release/9.0 — Alpine 3.21 (build image)

runtime/eng/pipelines/common/templates/pipeline-with-resources.yml

Line 71 in ef7db8d

image: mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.21-amd64

release/9.0 — Debian 12 (helix)

runtime/eng/pipelines/libraries/helix-queues-setup.yml

Line 29 in ef7db8d

- (Debian.12.Arm32.Open)Ubuntu.2204.ArmArch.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-12-helix-arm32v7

runtime/eng/pipelines/libraries/helix-queues-setup.yml

Line 51 in ef7db8d

- (Debian.12.Amd64.Open)AzureLinux.3.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-12-helix-amd64

release/8.0 — Ubuntu 20.04 (build image)

runtime/eng/pipelines/common/templates/pipeline-with-resources.yml

Line 25 in bad2fdc

image: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-20.04-cross-armv6-raspbian-10

release/8.0 — Debian 12 (helix + build image)

runtime/eng/pipelines/libraries/helix-queues-setup.yml

Line 31 in bad2fdc

- (Debian.12.Arm32.Open)AzureLinux.3.Arm64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-12-helix-arm32v7

runtime/eng/pipelines/common/templates/pipeline-with-resources.yml

Lines 98 to 99 in bad2fdc

	debian-12-gcc13-amd64:
	image: mcr.microsoft.com/dotnet-buildtools/prereqs:debian-12-gcc13-amd64

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This issue was generated by GitHub Copilot CLI v1.0.7 via the update-supported-os skill.

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