feat: add micromamba with multi-arch support (amd64 + arm64) - #2
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Pins MICROMAMBA_VERSION="2.8.1-0" and installs the static binary from GitHub releases, selecting linux-64 or linux-aarch64 via /etc/arch_vars so the image builds correctly on both x86_64 hosts and Apple Silicon Macs. Sets MAMBA_ROOT_PREFIX and runs micromamba shell init to wire the activation hook into ~/.bashrc at build time.
Keeps the single-source-of-truth pattern: all arch name mappings live in one place at the top of the Dockerfile, and every install step just sources /etc/arch_vars without needing its own case statement.
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Summary
MICROMAMBA_VERSION="2.8.1-0"in the version block alongside the other tools/etc/arch_varssourcing pattern — selectslinux-64on amd64 andlinux-aarch64on arm64, so the image builds correctly on both x86_64 hosts and Apple Silicon MacsMAMBA_ROOT_PREFIXenv var and runsmicromamba shell init --shell bashas thedevuser to wire the activation hook into~/.bashrcat build timemicromambato the CLI verification loop inpost-create.shTest plan
micromamba --versionprints2.8.1-0micromamba activateworks