feat: add Dockerfile

Dockerfile

@@ -0,0 +1,9 @@
+FROM alpine
+
+RUN set -ex; \
+    apk update --no-cache; \
+    apk add --no-cache -t .net-tools \
+        bash bash-completion bind-tools busybox-extras coreutils iproute2 iputils mtr net-tools \
+        netcat-openbsd tcpdump whois
+
+ENTRYPOINT ["/bin/bash"]

README.md

@@ -1,3 +1,11 @@
 # docker-alpine-net-tools
 
-A docker image that contains basic network tools, based on `alpine:latest`.
+A docker image that contains basic network tools, based on `alpine:latest`.
+
+## Usage
+
+```bash
+docker pull kanna5/alpine:net-tools
+
+docker run -it kanna5/alpine:net-tools
+```