Initial implementaion of the action

Dockerfile

@@ -0,0 +1,12 @@
+FROM ruby:2.6-alpine
+
+RUN apk add --no-cache git
+
+RUN set -x \
+  && gem install bundler keycutter
+
+COPY LICENSE README.md /
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 Jan Stastny
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,36 @@
+# Release Ruby Gem to GitHub Packages
+This action builds the gems for all `.gemspec` files in the projects root.
+
+## Example
+Example minimal workflow using this action:
+```yaml
+name: CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Build and publish gem
+      uses: jstastny/publish-gem-to-github@master
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+        owner: jstastny
+```
+
+See example project using this action at [https://github.com/jstastny/testgem](https://github.com/jstastny/testgem).
+
+## Inputs
+
+| Name | Description |
+| -----| ------------|
+| `token` | GitHub token that has write access to Packages. You can use `secrets.GITHUB_TOKEN` |
+| `owner` | Name of the user or organization account that owns the repository containing your project |
+
+## Versioning your gem
+This action currently does not bump the gem's version when building it. It is up to you to do it (either manually or in a previous workflow step).
+If you try to release gem in the same version that already exists, the step will fail.

action.yml

@@ -0,0 +1,16 @@
+name: 'Release Gem to GitHub Packages'
+description: 'Builds and publishes Ruby gems to GitHub Packages'
+author: 'Jan Stastny'
+inputs:
+  token:
+    description: 'GitHub token that has access to write to GitHub package registry. You can use GITHUB_TOKEN for this.'
+    required: true
+  owner:
+    description: 'Name of the user or organization account that owns the repository containing your project.'
+    required: true
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.token }}
+    - ${{ inputs.owner }}

entrypoint.sh

@@ -0,0 +1,18 @@
+#!/bin/sh -l
+
+GITHUB_TOKEN=$1
+OWNER=$2
+
+[ -z "${GITHUB_TOKEN}" ] && { echo "Missing input.token!"; exit 2; }
+[ -z "${OWNER}" ] && { echo "Missing input.owner!"; exit 2; }
+
+echo "Setting up access to GitHub Package Registry"
+mkdir -p ~/.gem
+touch ~/.gem/credentials
+chmod 600 ~/.gem/credentials
+echo ":github: Bearer ${GITHUB_TOKEN}" >> ~/.gem/credentials
+
+echo "Building the gem"
+gem build *.gemspec
+echo "Pushing the built gem to GitHub Package Registry"
+gem push --key github --host "https://rubygems.pkg.github.com/${OWNER}" *.gem