add container and go stuff

Dockerfile

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+FROM docker.io/golang:1.20 as builder
+
+WORKDIR /app
+
+COPY . ./
+RUN go mod download
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o /sanic
+
+# -----
+
+FROM builder AS tester
+
+RUN go test -v ./...
+
+# -----
+
+FROM scratch as runner
+
+WORKDIR /
+
+COPY --from=builder /sanic /sanic
+COPY --from=builder /app/static /static
+
+EXPOSE 8080
+
+ENTRYPOINT ["/sanic"]