updated with test action

.github/workflows/main.yml

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+on: [push]
+
+jobs:
+  hello_world_job:
+    runs-on: ubuntu-latest
+    name: A job to say hello
+    steps:
+    - name: Hello world action step
+      id: hello
+      uses: actions/url-test-github-action@v1
+      with:
+        who-to-greet: 'Mona the Octocat'
+    # Use the output from the `hello` step
+    - name: Get the output time
+      run: echo "The time was ${{ steps.hello.outputs.time }}"

Dockerfile

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+FROM python:3.7-alpine
+
+# 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"]

action.yml

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+name: 'Check for broken URL:s'
+description: 'Github action that checks for URL:s that return 404'
+inputs:
+  file-types:  # id of input
+    description: 'Which file types would we like to check for broken links'
+    required: true
+    default: '.md'
+outputs:
+  time: # id of output
+    description: 'The time we greeted you'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.who-to-greet }}

entrypoint.sh

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