feat(docker): add QEMU cross-compilation support

Add QEMU user-mode emulation for building aarch64 images (uConsole CM5):
- qemu-user-static: Static QEMU binaries for user-mode emulation
- binfmt-support: Linux kernel support for recognizing binary formats
- qemu-user-binfmt: Registers QEMU handlers with binfmt_misc

Enables cross-compilation of NixOS configurations for ARM devices
from the x86_64 Hermes container.

This is PR 4 of 5 for Docker package additions.
Depends on PR #10, #11, and #12.

docker/hermes/Dockerfile

@@ -18,7 +18,8 @@ RUN apt-get update && \
         curl poppler-utils imagemagick \
         chromium xvfb fonts-noto-color-emoji fonts-unifont fonts-liberation fonts-ipafont-gothic fonts-wqy-zenhei fonts-tlwg-loma-otf fonts-freefont-ttf \
         libasound2t64 libatk-bridge2.0-0t64 libatk1.0-0t64 libatspi2.0-0t64 libcairo2 libcups2t64 libdbus-1-3 libdrm2 libgbm1 libglib2.0-0t64 libnspr4 libnss3 libpango-1.0-0 libx11-6 libxcb1 libxcomposite1 libxdamage1 libxext6 libxfixes3 libxkbcommon0 libxrandr2 \
-        texlive-latex-base texlive-latex-extra texlive-fonts-recommended texlive-xetex texlive-science && \
+        texlive-latex-base texlive-latex-extra texlive-fonts-recommended texlive-xetex texlive-science \
+        qemu-user-static binfmt-support qemu-user-binfmt && \
     rm -rf /var/lib/apt/lists/*
 
 # Non-root user for runtime; UID can be overridden via HERMES_UID at runtime