Update acceptance Dockerfile for ruby3

Author: rick

spec/acceptance/Dockerfile.entitlements-gitrepo-auditor-plugin

@@ -1,4 +1,4 @@
-FROM ruby:2.7.5-buster
+FROM ruby:3.1-slim
 LABEL maintainer="GitHub Security Ops <[email protected]>"
 ENV HOME /root
 ENV RELEASE=buster
@@ -9,7 +9,12 @@ WORKDIR /data/entitlements
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
     build-essential \
     cmake \
-    ldap-utils
+    gcc \
+    git \
+    ldap-utils \
+    make \
+    iputils-ping \
+    pkg-config
 
 # Install bundler
 RUN gem install bundler