Add Dockerfile for containeraization

Dockerfile

@@ -0,0 +1,10 @@
+FROM golang:alpine
+EXPOSE 8080 1935
+RUN mkdir /app 
+ADD . /app
+WORKDIR /app
+RUN apk add --no-cache ffmpeg ffmpeg-libs
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags '-extldflags "-static"' -o owncast .
+RUN ls -al owncast
+WORKDIR /app
+CMD ["/app/owncast"]