add bats test under docker

test/Dockerfile

@@ -0,0 +1,25 @@
+ARG BASH
+
+FROM alpine/git:v2.30.0 as bats
+ARG BATS_VERSION
+  RUN git clone https://github.com/bats-core/bats-core.git /root/bats-core \
+        && cd /root/bats-core \
+        && git checkout "${BATS_VERSION}"
+
+FROM bash:$BASH
+  # Gnu tools
+  RUN if [[ "${GNU:-}" == True ]];then \
+    apk add sed coreutils findutils \
+  ;fi
+  # Bats
+  RUN apk add --update parallel ncurses git \
+        && mkdir -p ~/.parallel \
+        && touch ~/.parallel/will-cite
+  COPY --from=bats /root/bats-core /root/bats-core
+  RUN /root/bats-core/install.sh "/usr/local"
+  # Clean
+  RUN rm -rf /var/cache/apk/*
+  # Setup
+  RUN echo 'source /etc/profile' >> ~/.bashrc
+  WORKDIR /code/
+  CMD ["bash"]