url-shortener: build configuration files (#72)

* url-shortener: makefile and dockerfile

* makefile: make docker configurable

* makefile: manifest destination

* makefile: empy manifest

---------

Co-authored-by: Giorgi Lekveishvili <lekva@gl-mbp-m1-max.local>
diff --git a/apps/url-shortener/Dockerfile b/apps/url-shortener/Dockerfile
new file mode 100644
index 0000000..2de1afa
--- /dev/null
+++ b/apps/url-shortener/Dockerfile
@@ -0,0 +1,6 @@
+FROM alpine:latest
+
+ARG TARGETARCH
+
+COPY url-shortener_${TARGETARCH} /usr/bin/url-shortener
+RUN chmod +x /usr/bin/url-shortener