Create Dockerfile

docker/Dockerfile

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+FROM alpine:3.9 as builder_pandoc
+RUN apk update && \
+    apk add cabal \ 
+            zlib-dev \
+            wget \
+            ghc \
+            musl-dev && \
+    cabal update && \
+    cabal install --upgrade-dependencies --enable-per-component -j --force-reinstalls pandoc
+
+FROM alpine:3.9 as builder_ytdl
+COPY --from=builder_pandoc /root/.cabal /root/.cabal
+RUN apk update && \
+    apk add ffmpeg \
+            rtmpdump \
+            mplayer \
+            mpv \
+            python3 \
+            git \
+            make \
+            zip && \
+    ln -s /usr/bin/python3 /usr/bin/python && \
+    ln -s /root/.cabal/bin/pandoc /usr/local/bin/pandoc && \
+    git clone https://github.com/ytdl-org/youtube-dl.git && \
+    cd /youtube-dl && \
+    make -j && \
+    make install
+
+FROM alpine:3.9 as final
+COPY --from=builder_ytdl /usr/local/bin/youtube-dl /usr/local/bin/youtube-dl
+COPY --from=builder_ytdl /usr/local/man/man1/youtube-dl.1 /usr/local/man/man1/youtube-dl.1
+RUN apk update && \
+    apk add ffmpeg \
+            rtmpdump \
+            mplayer \
+            mpv \
+            python3 && \
+    ln -s /usr/bin/python3 /usr/bin/python && \
+    youtube-dl --version && \
+    rm -rf /var/cache/apk/*
+
+COPY init /init
+WORKDIR /home/dockeruser
+ENTRYPOINT ["/init"]
+