add Dockerfile

Dockerfile

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+FROM golang:1.20 as builder
+ARG TARGETOS
+ARG TARGETARCH
+
+WORKDIR /workspace
+COPY go.mod go.mod
+COPY go.sum go.sum
+RUN go mod download
+
+COPY main.go main.go
+COPY cmd/ cmd/
+COPY cardversions/ cardversions/
+COPY leagueclubs/ leagueclubs/
+COPY nations/ nations/
+COPY players/ players/
+
+RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -a -o futbin main.go
+
+FROM gcr.io/distroless/static:nonroot
+USER 65532:65532
+WORKDIR /
+COPY --from=builder /workspace/futbin .
+
+ENTRYPOINT ["/futbin"]