Compile libre2-dev for Ubuntu 22.04

GitHub: mudge/re2#65

From release 2023-07-01, re2 now requires Abseil (libabsl-dev) which is
only available by default on Ubuntu 22.04. As older versions of re2
compiled on Ubuntu 20.04 should continue to work, we'll continue to use
those even on newer GitHub Actions runners.

libre2-dev/22.04/Dockerfile

@@ -0,0 +1,14 @@
+FROM ubuntu:22.04
+
+RUN apt-get update
+
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends tzdata
+
+RUN apt-get install -y \
+    ruby ruby-dev rubygems build-essential git curl cmake libabsl-dev pkg-config
+
+RUN gem install --no-document fpm
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

libre2-dev/22.04/entrypoint.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+set -euo pipefail
+
+re2_release=$1
+version=$2
+
+# Download the re2 release from GitHub
+curl -L "https://github.com/google/re2/archive/${re2_release}.tar.gz" | tar xz
+cd "re2-${re2_release}"
+
+# Compile and install the release
+make install prefix=/usr DESTDIR=/tmp/installdir
+
+# Package up the release with fpm
+fpm -s dir -t deb -n libre2-dev -v "${version}" -C /tmp/installdir --replaces libre2-5 -d libabsl20210324 usr/include usr/lib