adding docker image

docker/Dockerfile

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+FROM alpine:3.7
+LABEL maintainer "me@jowj.net"
+
+# make container livable
+RUN apk update \
+    && apk add \
+        bash bash-doc \
+        emacs-nox emacs-doc \
+        git git-doc \
+        gnupg gnupg-doc \
+        groff groff-doc \
+        iputils \
+        man man-pages \
+        openssh-client openssh-doc \
+        openssl openssl-doc \
+        python3 python3-doc \
+        sudo sudo-doc \
+        tmux tmux-doc \
+    && python3 -m pip install \
+        awscli \
+    && apk add \
+        gcc \
+        linux-headers \
+        make \
+        musl-dev \
+        python2-dev \
+        python3-dev \
+        libffi-dev \
+        openssl-dev
+
+# install more specific applications
+RUN apk add \
+        nmap nmap-doc \
+        ansible ansible-doc \
+    && python3 -m ensurepip \
+    && python3 -m pip install --upgrade pip \
+    && python3 -m pip install \
+        ansible
+    
+CMD /bin/bash -i