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

pkg/can-go/tools/commitlint/rules.mk

@@ -0,0 +1,16 @@
+commitlint_cwd := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))
+commitlint := $(commitlint_cwd)/node_modules/.bin/commitlint
+
+$(commitlint): $(commitlint_cwd)/package.json
+	$(info [commitlint] installing package...)
+	@cd $(commitlint_cwd) && npm install --no-save --no-audit &> /dev/null
+	@touch $@
+
+.PHONY: commitlint
+commitlint: $(commitlint_cwd)/.commitlintrc.js $(commitlint)
+	$(info [$@] linting commit messages...)
+	@git fetch --tags
+	@NODE_PATH=$(commitlint_cwd)/node_modules $(commitlint) \
+		--config $< \
+		--from origin/master \
+		--to HEAD