fix(build): use docker-container buildx driver for multi-platform builds - #94
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The publish path failed on main with "Multi-platform build is not supported for the docker driver": builder-instance set up a docker *context* (docker driver), which only builds a single platform, so multi-arch publish could never work. Create a docker-container buildx builder instead (the driver multi-platform + QEMU emulation needs), and switch 'oci' to --load so the single-arch local image still lands in the daemon for 'docker image save'. The single-arch publish + cosign signing already worked (activemq); this unblocks the 17 dual-arch images. Assisted-by: ClaudeCode:claude-opus-4-8 Signed-off-by: Ronny Trommer <ronny@no42.org>
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The publish path failed on main with "Multi-platform build is not supported
for the docker driver": builder-instance set up a docker context (docker
driver), which only builds a single platform, so multi-arch publish could
never work. Create a docker-container buildx builder instead (the driver
multi-platform + QEMU emulation needs), and switch 'oci' to --load so the
single-arch local image still lands in the daemon for 'docker image save'.
The single-arch publish + cosign signing already worked (activemq); this
unblocks the 17 dual-arch images.
Assisted-by: ClaudeCode:claude-opus-4-8
Signed-off-by: Ronny Trommer ronny@no42.org