Starting with action tutorial

https://help.github.com/en/actions/building-actions/creating-a-docker-container-action

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"]

README.md

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-# coveralls-python-action
+# WIP coveralls-python-action
 GitHub Action for Python Coveralls.io
+
+# Hello world docker action
+
+This action prints "Hello World" or "Hello" + the name of a person to greet to the log.
+
+## Inputs
+
+### `who-to-greet`
+
+**Required** The name of the person to greet. Default `"World"`.
+
+## Outputs
+
+### `time`
+
+The time we greeted you.
+
+## Example usage
+
+uses: actions/hello-world-docker-action@v1
+with:
+  who-to-greet: 'Mona the Octocat'

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 }}

entrypoint.sh

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