Add dockerfile

Dockerfile

@@ -0,0 +1,20 @@
+FROM golang:alpine as build
+
+WORKDIR /root
+COPY . /root
+RUN go build .
+
+FROM alpine:latest
+
+ENV SWITCH_IP_ADDRESS="192.168.10.10" LISTEN_ADDRESS="0.0.0.0" LISTEN_PORT="9452"
+
+RUN addgroup -S mystrom \
+    && adduser -S mystrom -G mystrom \
+    && mkdir /app \
+    && chown -R mystrom:mystrom /app
+
+WORKDIR /app
+USER mystrom
+COPY --from=build /root/mystrom-exporter /app
+
+CMD /app/mystrom-exporter -web.listen-address $LISTEN_ADDRESS:$LISTEN_PORT -switch.ip-address $SWITCH_IP_ADDRESS