update dockerfile

Author: aireilly

Dockerfile

@@ -1,6 +1,21 @@
-# Dockerfile
-FROM centos:8
-RUN dnf install git python3 python3-devel ruby rubygems -y
-RUN gem install asciidoctor asciidoctor-diagram
+FROM ruby:3.1.2-alpine3.16 AS builder
+
+RUN apk update && apk add --virtual build-dependencies build-base
+
+RUN gem install listen asciidoctor asciidoctor-diagram ascii_binder
+
+FROM ruby:3.1.2-alpine3.16
+
+COPY --from=builder /usr/local/bundle /usr/local/bundle
+
+ENV PYTHONUNBUFFERED=1
+
+RUN apk add --update --no-cache git bash python3 python3-dev && ln -sf python3 /usr/bin/python
+
+RUN python3 -m ensurepip
+
+RUN pip3 install --no-cache --upgrade pip setuptools
+
 COPY . $HOME/src/
-RUN pip3 install pyyaml /src/aura.tar.gz
+
+RUN pip3 install --no-cache-dir pyyaml /src/aura.tar.gz