added dockerfile

Dockerfile

@@ -0,0 +1,13 @@
+FROM alpine
+
+RUN apk update
+RUN apk add --no-cache \
+	socat 
+
+WORKDIR /app
+
+COPY ./spell-warz .
+
+CMD socat tcp-listen:12345,reuseaddr,fork EXEC:\"./spell-warz\"
+
+EXPOSE 12345/tcp