Add basic integration tests

integration_tests/Dockerfile

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+FROM bats/bats
+
+RUN apk add --no-cache --update python3 py3-pip R
+RUN mkdir -p /root/.config/pip
+COPY pip.conf /root/.config/pip/pip.conf
+COPY Rprofile /root/.Rprofile

integration_tests/Rprofile

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+local({
+    r <- getOption("repos")
+    r["CRAN"] <- "http://localhost:8080/repository/cran-proxy"
+    options(repos=r)
+})

integration_tests/pip.conf

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+[global]
+index = http://localhost:8080/repository/pypi-proxy/pypi
+index-url = http://localhost:8080/repository/pypi-proxy/simple

integration_tests/test.sh

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+#! /usr/bin/env bash
+docker build -t nexus_allowlist_bats:latest .
+docker run \
+    --rm \
+    -it \
+    -v "$PWD/tests:/code" \
+    --network host \
+    nexus_allowlist_bats:latest \
+    /code

integration_tests/tests/cran.bats

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+@test "Install data.table" {
+    Rscript -e 'install.packages("data.table")'
+}

integration_tests/tests/pypi.bats

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+@test "Install numpy" {
+    python3 -m venv ./venv
+    . ./venv/bin/activate
+    pip install numpy
+}