New docker image

[faan11]

Hi,

I did the docker image for this repo.
https://hub.docker.com/r/faan11/mustache-cli

You can download it by using:
docker pull image faan11/mustache-cli
and then running by:
docker run -ti faan11/mustache-cli

It can be useful. You may add it to the Readme file.

[geso02]

An option to reduce the image size dramatically could be to use the builder approach:

FROM golang:1.19.3-alpine3.16 as builder
RUN go install github.com/cbroglie/mustache/...@v1.4.0

FROM alpine:3.16
COPY --from=builder /go/bin/mustache /usr/local/bin/mustache
ENTRYPOINT ["/usr/local/bin/mustache"]
CMD ["--help"]