Refactor kafka to pure Go (franz-go), fix DBC stubs, update Dockerfile

pkg/can-go/tools/git-verify-nodiff/git-verify-nodiff.bash

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -euo pipefail
+
+if [[ -n $(git status --porcelain) ]]; then
+  echo "Staging area is dirty, please add all files created by the build to .gitignore"
+  git diff --patch
+  exit 1
+fi

pkg/can-go/tools/git-verify-nodiff/rules.mk

@@ -0,0 +1,7 @@
+git_verify_nodiff_cwd := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))
+git_verify_nodiff := $(git_verify_nodiff_cwd)/git-verify-nodiff.bash
+
+.PHONY: git-verify-nodiff
+git-verify-nodiff:
+	@echo verifying that git has no diff...
+	@$(git_verify_nodiff)