Added docker stuffs

.dockerignore

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+README.md

Dockerfile

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+FROM alpine:latest AS build
+
+ADD . /build/
+WORKDIR /build
+
+RUN apk update && apk add make cmake gcc musl-dev && cmake . && make -j 8
+
+FROM alpine:latest
+
+COPY --from=build /build/caff_previewer /usr/local/bin/
+
+CMD "/usr/local/bin/caff_previewer"