Add multiplayer server Dockerfile

server/Dockerfile

@@ -0,0 +1,14 @@
+FROM golang:1.23-alpine AS build
+WORKDIR /src
+COPY go.mod ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go test ./... && go build -trimpath -ldflags='-s -w' -o /out/airship-server .
+
+FROM alpine:3.21
+RUN apk add --no-cache ca-certificates
+WORKDIR /app
+COPY --from=build /out/airship-server /app/airship-server
+EXPOSE 8080
+HEALTHCHECK --interval=10s --timeout=3s --start-period=5s --retries=5 CMD wget -qO- http://127.0.0.1:8080/health >/dev/null || exit 1
+ENTRYPOINT ["/app/airship-server"]