Change Dockerfile to support ffmpeg version 4

[sepisoltani]

Container should have ffmpeg version 4 on it . But Dockerfile has no ffmpeg support .
So hls and dash cant start when runing container . I changed dockerfile to install ffmepg version 4 to fix this problem .

[hthetiot]

Here is my current solution using sitkevij/ffmpeg:4.0-alpine reference instead of duplicating content:

FROM sitkevij/ffmpeg:4.0-alpine
FROM node:10.15.0-alpine

# copy ffmpeg bins from first image
COPY --from=0 / /

WORKDIR /usr/src/app

COPY package*.json ./

RUN npm i

COPY . .

EXPOSE 1935 8000

CMD ["node","app.js"]

[hthetiot]

Made new PR with fixed Dockerfile labels and OpenSSL for RTMPS support:

• add ffmpeg binary support to Dockerfile with RTMPS via OpenSSL #356

[hthetiot]

Duplicate of merged PR #356 can be closed.