workflows: Fix devcontainer builds to support both amd64 and arm64 #45
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The previous matrix configuration only built arm64 images. This restructures the matrix to create all 4 combinations (debian/c10s × amd64/arm64) by using proper matrix axes and deriving values like platform and containerfile paths from the matrix variables, reducing duplication and ensuring both architectures are published. Also standardize on ubuntu-24.04 runners throughout instead of ubuntu-latest. Assisted-by: Claude Code (Sonnet 4.5) Signed-off-by: Colin Walters <walters@verbum.org>
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The previous matrix configuration only built arm64 images. This restructures the matrix to create all 4 combinations (debian/c10s × amd64/arm64) by using proper matrix axes and deriving values like platform and containerfile paths from the matrix variables, reducing duplication and ensuring both architectures are published.
Also standardize on ubuntu-24.04 runners throughout instead of ubuntu-latest.
Assisted-by: Claude Code (Sonnet 4.5)