initial code commit

Dockerfile

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+FROM alpine:3.10
+COPY entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

action.yml

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+name: 'Get current package version'
+description: 'Get the current version of the npm package'
+outputs:
+  current-version:
+    description: 'Current version defined in the package.json file'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+

entrypoint.sh

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+#!/bin/sh -l
+
+PACKAGE_VERSION=$(cat package.json | grep version | head -1 | awk -F: '{ print $2 }' | sed 's/[",]//g' | tr -d '[[:space:]]')
+
+echo ::set-output name=current-version:$PACKAGE_VERSION