add R building machinery

languages/R/Dockerfile

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+FROM ubuntu:focal
+RUN : \
+    # https://askubuntu.com/questions/496549/error-you-must-put-some-source-uris-in-your-sources-list
+    && sed -i 's/^# deb-src /deb-src /' /etc/apt/sources.list \
+    && apt-get update \
+    && DEBIAN_FRONTEND=noninteractive apt-get -y --no-install-recommends build-dep r-base \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends curl \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+ARG R_VERSION
+ARG R_SHA256
+RUN : \
+    && set -x \
+    && mkdir /tmp/r \
+    && cd /tmp/r \
+    && curl --silent --location --output r.tgz "https://cran.rstudio.com/src/base/R-${R_VERSION%%.*}/R-$R_VERSION.tar.gz" \
+    && echo "${R_SHA256}  r.tgz" | sha256sum --check \
+    && tar -xf r.tgz \
+    && cd "R-${R_VERSION}" \
+    && mkdir -p /opt/r/ \
+    && ./configure \
+        --prefix=/opt/r/ \
+        --enable-memory-profiling \
+        --enable-R-shlib \
+        --with-blas \
+        --with-lapack \
+        --without-recommended-packages \
+    && make \
+    && make install \
+    && rm -rf /tmp/r \
+    && :

languages/R/build.sh

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+#!/usr/bin/env bash
+set -euxo pipefail
+
+R_VERSION=4.0.2
+R_SHA256=d3bceab364da0876625e4097808b42512395fdf41292f4915ab1fd257c1bbe75
+
+podman build \
+    --build-arg=R_VERSION="$R_VERSION" \
+    --build-arg=R_SHA256="$R_SHA256" \
+    -t runner-image-r .
+
+cid="$(podman create runner-image-r sleep infinity)"
+trap 'podman rm -f "$cid"' exit
+
+podman start "$cid"
+podman exec "$cid" rm -rf /opt/r/lib/R/doc /opt/r/share
+podman exec "$cid" \
+    tar -C /opt/r \
+    --sort=name \
+    --mtime="1970-01-01 00:00:00Z" \
+    --owner=0 --group=0 --numeric-owner \
+    -czf /tmp/r.tgz .
+
+podman cp "$cid:/tmp/r.tgz" "r-${R_VERSION}.tgz"
+sha256sum "r-${R_VERSION}.tgz"