add a Dockerfile

Dockerfile

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+FROM alpine AS builder
+
+# Check required arguments exist. These will be provided by the Github Action
+# Workflow and are required to ensure the correct branches are being used.
+ARG SPS_ALSA_EXPLORE_BRANCH
+RUN test -n "$SPS_ALSA_EXPLORE_BRANCH"
+
+RUN apk -U add \
+        autoconf \
+        automake \
+        build-base \
+        git \
+        alsa-lib-dev
+
+##### Build  #####
+WORKDIR /sps-alsa-explore
+COPY . .
+RUN git checkout "$SPS_ALSA_EXPLORE_BRANCH"
+RUN autoreconf -i 
+RUN ./configure
+RUN make
+WORKDIR /
+##### Built #####
+
+# sps-alsa-explore runtime
+FROM alpine
+
+RUN apk -U add \
+        alsa-lib
+
+# Copy build files.
+COPY --from=builder /sps-alsa-explore/sps-alsa-explore /
+
+# Remove anything we don't need.
+RUN rm -rf /lib/apk/db/*
+
+Entrypoint ["/sps-alsa-explore"]