LinuxBrew linux/arm64 - ruby:2.6.10-alpine - modified installer to find ruby on path

Dockerfile

FROM --platform=linux/arm64 ruby:2.6.10-alpine
RUN ruby --version && which ruby
RUN apk add bash curl build-base git gcompat && \
      rm -rf /var/lib/apt/lists
# Install homebrew for aarch64 linux
# Uses modified installer script to allow for aarch64
ENV PATH="/usr/local/bin:$PATH:/home/linuxbrew/.linuxbrew/bin"
# 1. you54f/brew git remote allows successful path lookup on install so you can use a custom ruby version
RUN HOMEBREW_BREW_GIT_REMOTE="https://github.com/you54f/brew"  \
# 2. ./install.sh allows for linux-aarch64
      NONINTERACTIVE=1 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/you54f/install/HEAD/install.sh)"
# 3. set remote back to homebrew
RUN git -C "/home/linuxbrew/.linuxbrew/Homebrew" remote set-url origin https://github.com/Homebrew/brew

RUN brew --version
RUN brew config
RUN brew doctor || echo "expected brew doctor failre regarding unsupported hardware (arm64) "
RUN brew upgrade
ENTRYPOINT [ "brew" ]