add basic out script

Dockerfile

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+FROM python:3.5-alpine
+
+# https://github.com/yikaus/docker-alpine-bash/blob/34b9807/Dockerfile#L4
+RUN apk add --update bash
+
+RUN pip install --upgrade pip
+RUN pip install --upgrade awscli
+
+ADD assets/ /opt/resource/
+# RUN chmod a+x
+
+CMD echo Simple S3 Resource ready.

README.md

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+# Simple S3 Resource for [Concourse CI](http://concourse.ci)
+
+## Development
+
+Requires Docker.
+
+```bash
+docker build -t s3-resource-simple .
+docker run --rm s3-resource-simple /opt/resource/out
+```

assets/out

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+#!/bin/bash
+
+set -e
+set -x
+
+echo foo