Add .deb packaging

Makefile

@@ -2,8 +2,18 @@ default:
 
 dist:
 	mkdir -p dist
+	cp etc/litestream.yml dist/litestream.yml
 	docker run --rm -v "${PWD}":/usr/src/litestream -w /usr/src/litestream -e GOOS=linux -e GOARCH=amd64 golang:1.15 go build -v -o dist/litestream ./cmd/litestream
 	tar -cz -f dist/litestream-linux-amd64.tar.gz -C dist litestream
-	rm dist/litestream
 
-.PHONY: dist
+deb: dist
+ifndef VERSION
+	$(error VERSION is undefined)
+endif
+	cat etc/nfpm.yml | envsubst > dist/nfpm.yml
+	nfpm pkg --config dist/nfpm.yml --packager deb --target dist/litestream.deb 
+
+clean:
+	rm -rf dist
+
+.PHONY: deb dist clean