unit tests

Signed-off-by: Casey Lee <cplee@nektos.com>

pkg/runner/testdata/actions/docker-local/Dockerfile

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+# Container image that runs your code
+FROM alpine:3.10
+
+# Copies your code file from your action repository to the filesystem path `/` of the container
+COPY entrypoint.sh /entrypoint.sh
+
+# Code file to execute when the docker container starts up (`entrypoint.sh`)
+ENTRYPOINT ["/entrypoint.sh"]

pkg/runner/testdata/actions/docker-local/action.yml

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+name: 'Hello World'
+description: 'Greet someone and record the time'
+inputs:
+  who-to-greet:  # id of input
+    description: 'Who to greet'
+    required: true
+    default: 'World'
+outputs:
+  time: # id of output
+    description: 'The time we greeted you'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.who-to-greet }}

pkg/runner/testdata/actions/docker-local/entrypoint.sh

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+#!/bin/sh -l
+
+echo "Hello $1"
+time=$(date)
+echo ::set-output name=time::$time