feat(github-runner): bake Ruby 3.3 into Linux self-hosted runner image (Q-MR-81)

apps/github-runner/Dockerfile

@@ -0,0 +1,44 @@
+FROM myoung34/github-runner:latest
+
+ARG RUBY_VERSION=3.3.11
+ARG RUBY_MINOR=3.3
+ARG RUBY_BUILD_VERSION=v20260326
+ARG RUNNER_UID=1001
+ARG RUNNER_GID=1001
+
+ENV RUNNER_TOOL_CACHE=/home/runner/_tool
+ENV RUNNER_RUBY_TOOLCACHE=/opt/runner-toolcache
+ENV PATH="/home/runner/_tool/Ruby/${RUBY_MINOR}/x64/bin:/opt/runner-toolcache/Ruby/${RUBY_MINOR}/x64/bin:${PATH}"
+
+USER root
+
+RUN apt-get update \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+        autoconf \
+        bison \
+        build-essential \
+        ca-certificates \
+        curl \
+        libdb-dev \
+        libffi-dev \
+        libgdbm-dev \
+        libgmp-dev \
+        libncurses-dev \
+        libreadline-dev \
+        libssl-dev \
+        libyaml-dev \
+        patch \
+        pkg-config \
+        uuid-dev \
+        zlib1g-dev \
+    && curl -fsSL "https://github.com/rbenv/ruby-build/archive/refs/tags/${RUBY_BUILD_VERSION}.tar.gz" -o /tmp/ruby-build.tar.gz \
+    && mkdir -p /tmp/ruby-build \
+    && tar -xzf /tmp/ruby-build.tar.gz --strip-components=1 -C /tmp/ruby-build \
+    && /tmp/ruby-build/install.sh \
+    && rm -rf /tmp/ruby-build /tmp/ruby-build.tar.gz /var/lib/apt/lists/*
+
+COPY install-ruby-toolcache.sh /usr/local/bin/install-ruby-toolcache.sh
+
+RUN chmod +x /usr/local/bin/install-ruby-toolcache.sh \
+    && RUBY_VERSION="${RUBY_VERSION}" RUBY_MINOR="${RUBY_MINOR}" TOOLCACHE_ROOT="${RUNNER_RUBY_TOOLCACHE}" RUNNER_UID="${RUNNER_UID}" RUNNER_GID="${RUNNER_GID}" /usr/local/bin/install-ruby-toolcache.sh \
+    && ruby -v