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

pkg/can-go/tools/golangci-lint/rules.mk

@@ -0,0 +1,24 @@
+golangci_lint_cwd := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))
+golangci_lint_version := 1.37.0
+golangci_lint := $(golangci_lint_cwd)/$(golangci_lint_version)/golangci-lint
+
+ifeq ($(shell uname),Linux)
+golangci_lint_archive_url := https://github.com/golangci/golangci-lint/releases/download/v${golangci_lint_version}/golangci-lint-${golangci_lint_version}-linux-amd64.tar.gz
+else ifeq ($(shell uname),Darwin)
+golangci_lint_archive_url := https://github.com/golangci/golangci-lint/releases/download/v${golangci_lint_version}/golangci-lint-${golangci_lint_version}-darwin-amd64.tar.gz
+else
+$(error unsupported OS: $(shell uname))
+endif
+
+$(golangci_lint):
+	$(info building golangci-lint...)
+	@mkdir -p $(dir $@)
+	@curl -sSL $(golangci_lint_archive_url) -o - | \
+		tar -xz --directory $(dir $@) --strip-components 1
+	@chmod +x $@
+	@touch $@
+
+.PHONY: go-lint
+go-lint: $(golangci_lint)
+	$(info linting Go code with golangci-lint...)
+	@$(golangci_lint) run