Delete Dockerfile.dev

which was part of the beamer testbed and was missed when that was all
ripped out in f66544b9

Dockerfile.dev

@@ -1,39 +0,0 @@
-# syntax = docker/dockerfile:1
-
-# Make sure RUBY_VERSION matches the Ruby version in .ruby-version
-ARG RUBY_VERSION=3.4.7
-FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim AS base
-
-# Rails app lives here
-WORKDIR /rails
-
-# Set development environment
-ENV RAILS_ENV="development" \
-    BUNDLE_PATH="/usr/local/bundle"
-
-# Install packages needed for development
-RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y curl libsqlite3-0 libvips build-essential pkg-config git ffmpeg groff libreoffice-writer libreoffice-impress libreoffice-calc mupdf-tools libyaml-dev libssl-dev sqlite3 && \
-    rm -rf /var/lib/apt/lists /var/cache/apt/archives
-
-# Install application gems
-COPY Gemfile Gemfile.lock .ruby-version ./
-COPY lib/fizzy.rb ./lib/fizzy.rb
-COPY gems ./gems/
-RUN --mount=type=secret,id=GITHUB_TOKEN --mount=type=cache,id=fizzy-devbundle-${RUBY_VERSION},sharing=locked,target=/devbundle \
-    gem install bundler foreman && \
-    BUNDLE_PATH=/devbundle BUNDLE_GITHUB__COM="$(cat /run/secrets/GITHUB_TOKEN):x-oauth-basic" bundle install && \
-    cp -a /devbundle/. "$BUNDLE_PATH"/ && \
-    bundle clean --force
-
-# Final stage
-FROM base
-
-# Entrypoint prepares the database
-ENTRYPOINT ["/rails/bin/docker-entrypoint"]
-
-# Start the server by default
-EXPOSE 3000
-EXPOSE 3006
-EXPOSE 5001
-CMD ["./bin/thrust", "./bin/rails", "server"]