Adds dockerfile

.github/workflows/main.yml

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+name: A workflow for my Hello World file
+on: push

action-a/Dockerfile

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+FROM debian:9.5-slim
+
+ADD entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

action-a/action.yml

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+name: "Hello Actions"
+description: "Greet someone"
+author: "octocat@github.com"
+
+inputs:
+  MY_NAME:
+    description: "Who to greet"
+    required: true
+    default: "World"
+
+runs:
+  using: "docker"
+  image: "Dockerfile"
+
+branding:
+  icon: "mic"
+  color: "purple"

action-a/entrypoint.sh

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+#!/bin/sh -l
+
+sh -c "echo Hello world my name is $INPUT_MY_NAME"