getting ready for CI

Dockerfile

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+## lint image
+## current as of 2022-01-25
+FROM golangci/golangci-lint@sha256:c833decc0e2e1ee64ab8c27074929c94db1ef3e230aaf848a0d9bf7795fe4f44 AS linter
+
+RUN mkdir -p /build
+WORKDIR /build
+COPY ./ ./
+RUN golangci-lint run
+
+## build image:
+# this is golang:1.17.6-buster as of 2022-01-27
+FROM golang@sha256:52a48e0239f4d645b20ac268a60361703afe7feb2df5697fa89f72052cb87a3e AS builder
+#FROM golang:1.16-buster AS builder
+
+ENV DEBIAN_FRONTEND noninteractive
+RUN apt update && apt install -y make bzip2
+
+RUN mkdir -p /build
+WORKDIR /build
+
+COPY go.mod .
+COPY go.sum .
+
+COPY ./ ./
+RUN make lint
+RUN go mod vendor
+RUN make
+RUN tar -c . | bzip2 > /src.tbz2