Create dockerfile to build docker image

Signed-off-by: Jérémie Drouet <jeremie.drouet@gmail.com>

.dockerignore

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+EXAMPLES
+Dockerfile
+.github

Dockerfile

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+FROM debian:buster AS builder
+
+RUN apt-get update \
+  && apt-get install -y make gcc \
+  && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /workdir
+COPY . /workdir
+RUN make install
+
+FROM debian:buster-slim
+
+COPY --from=builder /usr/local/lib/libpigpio.so.1 /usr/local/lib/libpigpio.so.1
+COPY --from=builder /usr/local/bin/pigpiod /usr/local/bin/pigpiod
+
+RUN ldconfig
+
+CMD ["/usr/local/bin/pigpiod", "-g"]