Add a Dockerfile and update BAPC21-theme submodule (#86)

.dockerignore

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+Dockerfile
+.github
+

Dockerfile

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+
+
+FROM alpine:latest
+
+ARG HUGO_VERSION=0.68.3
+
+RUN apk add git
+
+WORKDIR /tmp
+RUN wget https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/hugo_${HUGO_VERSION}_Linux-64bit.tar.gz -O hugo.tar.gz \
+	&& tar -xzf hugo.tar.gz \
+	&& cp hugo /opt/hugo \
+	&& rm -rf /tmp/*
+
+WORKDIR /usr/src/app
+COPY . .
+RUN git submodule init && git submodule update --remote --merge
+
+EXPOSE 1313
+CMD [ "/opt/hugo", "server", "--bind=0.0.0.0" ]
+