add youtube-dl

youtube-dl/Dockerfile

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+FROM python:3-alpine
+
+MAINTAINER Newnius <newnius.cn@gmail.com>
+
+RUN wget https://yt-dl.org/downloads/latest/youtube-dl -O /usr/local/bin/youtube-dl && \
+    chmod a+rx /usr/local/bin/youtube-dl
+
+CMD ["youtube-dl", "--help"]

youtube-dl/README.md

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+# Run youtube-dl in docker
+
+## Run
+
+```bash
+docker run \
+	-it \
+	--rm \
+	--name youtube-dl \
+	--mount type=bind,src=/etc/localtime,dst=/etc/localtime,readonly \
+	--mount type=bind,src=/data/youtube/,dst=/output/ \
+	newnius/youtube-dl youtube-dl -o '/output/%(id)s.%(ext)s' 'https://www.youtube.com/watch?v=LXb3EKWsInQ'
+```
+