build(docker): migrate image to Debian bookworm-slim#19
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Move the whisper and runtime stages from Alpine to debian:bookworm-slim (glibc), keeping the Go build stage on golang:1.25-alpine since the binary is CGO_ENABLED=0 static and runs unchanged on the Debian runtime. - runtime/whisper: apt-get with --no-install-recommends, Debian package names (libstdc++6), gh from the official apt repo, useradd for the non-root odek user. - agent toolchains: Python 3 + python3-venv (PEP 668), Go from the official tarball, Bun glibc build. - whisper: add -DGGML_NATIVE=OFF. Debian's GCC 12 fails to inline FP16 NEON intrinsics (vfmaq_f16, "target specific option mismatch") under the default -mcpu=native on arm64. A fixed baseline arch sidesteps it, builds on amd64 and arm64, and keeps the image reproducible. Verified: full image builds; Debian 12 base; odek (static) and whisper-cli run; gh/git/ffmpeg/python3/go/bun present; runs as odek. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Move the whisper and runtime stages from Alpine to debian:bookworm-slim (glibc), keeping the Go build stage on golang:1.25-alpine since the binary is CGO_ENABLED=0 static and runs unchanged on the Debian runtime.
Verified: full image builds; Debian 12 base; odek (static) and whisper-cli run; gh/git/ffmpeg/python3/go/bun present; runs as odek.