Use ruby-build

Dockerfile

@@ -7,27 +7,54 @@ ARG RUBY_VERSION=3.2
 # build phase, but not leak into the final image and run phase.
 ARG DEBIAN_FRONTEND=noninteractive
 
-RUN apt-get update -qq \
+# Install system dependencies.
+RUN apt-get update --quiet=2 \
+    && apt-get install --quiet --yes \
+      apt-transport-https \
+      ca-certificates \
+      curl \
+      gnupg
+
+# Install Ruby dependencies.
+RUN apt-get update --quiet=2 \
     && apt-get install --yes --no-install-recommends \
+      autoconf \
+      bison \
+      patch \
       build-essential \
-      ca-certificates \
-      wget \
+      rustc \
       libssl-dev \
+      libyaml-dev \
+      libreadline6-dev \
+      zlib1g-dev \
+      libgmp-dev \
+      libncurses5-dev \
+      libffi-dev \
+      libgdbm6 \
+      libgdbm-dev \
+      libdb-dev \
+      uuid-dev \
+      # Other dependencies...
       default-libmysqlclient-dev \
-      clang clang-tools \
+      clang \
+      clang-tools \
       llvm \
       valgrind \
       netcat
 
 RUN update-ca-certificates
 
-RUN wget https://github.com/postmodern/ruby-install/releases/download/v0.9.0/ruby-install-0.9.0.tar.gz \
-    && tar -xzvf ruby-install-0.9.0.tar.gz \
-    && cd ruby-install-0.9.0 \
-    && make install
-
-RUN ruby-install --system ruby ${RUBY_VERSION}
-RUN ruby --version
+RUN if which ruby >/dev/null 2>&1; then \
+      echo "Ruby is already installed: $(ruby --version)"; \
+    else \
+      curl --location \
+        "https://github.com/rbenv/ruby-build/archive/refs/tags/$(basename $(curl --location --silent --output /dev/null --write-out %{url_effective} https://github.com/rbenv/ruby-build/releases/latest)).tar.gz" \
+          | tar --extract --gzip \
+      && PREFIX=/usr/local ./ruby-build-*/install.sh \
+      && rm -rf ./ruby-build-*/install.sh \
+      && ruby-build ${RUBY_VERSION}.0 /usr/local \
+      && echo "Installed Ruby: $(ruby --version)"; \
+    fi
 
 WORKDIR /app
 COPY . .