Update 'Dockerfile'

Dockerfile

@@ -6,7 +6,7 @@ RUN apt-get update -y && apt-get install -y \
   build-essential \
   cmake \
   git
-
+RUN apk add git make g++
 RUN git clone https://github.com/jgarff/rpi_ws281x.git \
   && cd rpi_ws281x \ 
   && mkdir build \
@@ -17,7 +17,7 @@ RUN git clone https://github.com/jgarff/rpi_ws281x.git \
 
 # Stage 1 : Build a go image with the rpi_ws281x C library and the go wrapper
 
-FROM golang:latest
+FROM golang:alpine
 COPY --from=lib_builder /usr/local/lib/libws2811.a /usr/local/lib/
 COPY --from=lib_builder /usr/local/include/ws2811 /usr/local/include/ws2811