Add initial version

Dockerfile

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+# Set the base image.
+FROM gradle:jdk11
+
+# Download the plugin verifier.
+RUN curl -L --output /verifier.jar https://dl.bintray.com/jetbrains/intellij-plugin-service/org/jetbrains/intellij/plugins/verifier-cli/1.222/verifier-cli-1.222-all.jar
+
+# Copy the initialisation script.
+COPY docker-entrypoint.sh /usr/bin/entrypoint.sh
+RUN chmod +x /usr/bin/entrypoint.sh
+ENTRYPOINT entrypoint.sh

LICENSE

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+MIT License
+
+Copyright (c) 2020 Pieter De Clercq
+
+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

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+# IntelliJ Plugin Verifier GitHub Action
+
+Use GitHub Actions to verify the compatibility of your IntelliJ plugin against any version of IntelliJ IDEA.
+
+## Usage
+
+Simply add the action to your workflow-file and specify the path to your plugin, as well as the desired version of IntelliJ IDEA to test, as shown in hte example:
+
+```yaml
+steps:
+- uses: actions/checkout@master
+- uses: thepieterdc/intellij-plugin-verifier-action@v1.0.0
+  with:
+    plugin: '/path/to/plugin.zip'
+    version: '181.5684.4'
+```
+
+## Arguments
+
+This action currently requires 2 arguments:
+
+| Input  | Description | Usage |
+| :---:     |     :---:   |    :---:   |
+| `plugin`  | The path to the `zip`-distribution of the plugin, generated by executing `./gradlew buildPlugin` | *Required* |
+| `version`  | Release of IntelliJ that should be used to validate against | *Required* |
+
+## Example
+The following example builds a plugin using Gradle, and validates it against IDEA build `193.5662.53`.
+
+```yaml
+name: Plugin compatibility
+on: [push]
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Setup Java
+      uses: actions/setup-java@v1
+      with:
+        java-version: 11.x.x
+    - name: Build the plugin using Gradle
+      run: ./gradlew buildPlugin
+    - uses: thepieterdc/intellij-plugin-verifier-action@v1.0.0
+      with:
+        plugin: '/home/runner/work/demo-plugin/demo-plugin/build/distributions/demo-plugin-1.0.0-SNAPSHOT.zip'
+        version: '193.5662.53'
+```
+## Contributing
+
+Contributions are always appreciated in the form of pull requests/issues.
+
+## License
+
+The code in this project is released under the [MIT License](LICENSE).

action.yml

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+name: 'IntelliJ Plugin Verifier'
+description: 'GitHub Action that verifies plugin compatibility with any version of IntelliJ IDEA.'
+author: 'Pieter De Clercq <@thepieterdc>'
+inputs:
+  plugin:
+    description: 'Path to the plugin distribution zip file'
+    required: true
+  version:
+    description: 'The version of IntelliJ that should be validated against'
+    required: true
+branding:
+  color: 'green'
+  icon: 'check-circle'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.plugin }}
+    - ${{ inputs.version }}

docker-entrypoint.sh

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+#!/bin/sh
+
+set -eu
+
+# Create a directory to store the IDEs in.
+mkdir -p /ides
+
+# Download the required IntelliJ version.
+curl -L --output "idea-$INPUT_VERSION.zip" "https://www.jetbrains.com/intellij-repository/releases/com/jetbrains/intellij/idea/ideaIU/$INPUT_VERSION/ideaIU-$INPUT_VERSION.zip"
+
+# Extract the zip.
+unzip -d "/ides/$INPUT_VERSION" "idea-$INPUT_VERSION.zip"
+
+# Set the correct JAVA_HOME path in case this is overwritten by a setup-java action.
+JAVA_HOME="/opt/java/openjdk"
+
+# Execute the verifier.
+echo "Running verification..."
+java -jar /verifier.jar check-plugin "$INPUT_PLUGIN" "/ides/$INPUT_VERSION" 2>&1 > "log-$INPUT_VERSION.txt"
+
+# Output the log
+cat "log-$INPUT_VERSION.txt"
+
+# Validate the log
+egrep "^Plugin (.*) against .*: Compatible$" "log-$INPUT_VERSION.txt"