convert repo plugin to golang

plugins/repo/Makefile

@@ -0,0 +1,14 @@
+.PHONY: build-in-docker build commands subcommands
+
+build-in-docker: clean
+	docker run --rm \
+		-v $$PWD/../..:$(GO_REPO_ROOT) \
+		-w $(GO_REPO_ROOT)/plugins/repo \
+		$(BUILD_IMAGE) \
+		bash -c "make build" || exit $$?
+
+build:
+	cd src && go build -a -o ../commands
+
+clean:
+	rm -f commands