Add simpler and faster debug Makefile target

debug.Dockerfile

@@ -0,0 +1,10 @@
+FROM alpine:3.14
+# Feel free to add below any helpful dependency for debugging.
+# iproute2 is for ss.
+RUN apk --no-cache --no-progress add bash curl ca-certificates tzdata lsof iproute2 \
+    && update-ca-certificates \
+    && rm -rf /var/cache/apk/*
+COPY dist/traefik /
+EXPOSE 80
+VOLUME ["/tmp"]
+ENTRYPOINT ["/traefik"]