add dockerfile for action the first

.github/workflows/main.yml

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+---
+name: A workflow for my Hello World file
+on: push
+jobs:
+  build:
+    name: Hello world action
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - uses: ./action-a
+        env:
+          MY_NAME: "Mona"

action-a/Dockerfile

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+FROM debian:9.5-slim
+
+LABEL "com.github.actions.name"="Hello World"
+LABEL "com.github.actions.description"="Write arguments to the standard output"
+LABEL "com.github.actions.icon"="mic"
+LABEL "com.github.actions.color"="purple"
+
+LABEL "repository"="http://github.com/octocat/hello-world"
+LABEL "homepage"="http://github.com/actions"
+LABEL "maintainer"="Octocat <[email protected]>"
+
+ADD entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

action-a/entrypoint.sh

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