Initial create

Dockerfile

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+FROM ruby:2.6.0
+
+ENV LC_ALL C.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US.UTF-8
+
+ADD entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

README.md

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+# GitHub Action - Publish Gem to Rubygems
+
+This is a GitHub Action written to streamline the Ruby gem publication process.  The action sets the Gem Credentials from `GITHUB_TOKEN` and `RUBYGEMS_API_KEY`secrets, and then runs `rake release` in your project root.  You can override this command by setting `RELEASE_COMMAND` environment variable to the script that creates and publishes (this is usually only the case when a repository hosts multiple gems together).
+
+# Secrets Needed
+
+`GITHUB_TOKEN` - Bundler needs this to create tags on your repo for the release
+`RUBYGEMS_API_KEY` - The Rubygems API Key for an Owner of the Gem you wish to publish.  You can find your API Key by looking in `~/.gem/credentials` or using the [Rubygems API](https://guides.rubygems.org/rubygems-org-api/#misc-methods)
+
+# Env Options
+
+`RELEASE_COMMAND` - By default, this will invoke `rake release` to build and publish the gem to Rubygems.  Set this environment variable if you have a custom release command to be invoked
+
+# Example
+
+```hcl
+workflow "Publish Gem" {
+    on = "release"
+    resolves = ["Release Gem"]
+}
+
+action "Install Dependencies" {
+  uses = "docker://ruby:2.6.0"
+  args = "bundle install"
+}
+
+action "Release Gem" {
+  uses = "cadwallion/publish-rubygems-action@master"
+  secrets = ["GITHUB_TOKEN", "RUBYGEMS_API_KEY"]
+  env = {
+    "RELEASE_COMMAND" = "rake dotenv:release"
+  }
+  needs = ["Install Dependencies"]
+}
+```

entrypoint.sh

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+#!/bin/bash
+
+echo "Setting up gem credentials..."
+set +x
+mkdir -p ~/.gem
+cat << EOF > ~/.gem/credentials
+---
+:github: Bearer ${GITHUB_TOKEN}
+:rubygems_api_key: ${RUBYGEMS_API_KEY}
+EOF
+set -x
+
+echo "Running gem release task..."
+release_command="${RELEASE_COMMAND:-rake release}"
+exec $release_command