add github actions

.github/workflows/build.yml

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+name: Java CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+    - name: Get Fetch Tags
+      run: git -c protocol.version=2 fetch --tags --progress --no-recurse-submodules origin
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+    - name: Build with Gradle
+      run: ./gradlew build
+    - name: Get Release Version
+      id: get_version
+      run: VERSION=$(./gradlew currentVersion -q -Prelease.quiet) && echo ::set-output name=VERSION::$VERSION
+    - name: Upload openssh-node-execution zip
+      uses: actions/upload-artifact@v1.0.0
+      with:
+        # Artifact name
+        name: openssh-node-execution-${{ steps.get_version.outputs.VERSION }}
+        # Directory containing files to upload
+        path: ./build/libs/openssh-node-execution-${{ steps.get_version.outputs.VERSION }}.zip

.github/workflows/release.yml

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+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+    - '*' # Push events to matching v*, i.e. v1.0, v20.15.10
+
+name: Create Release
+
+jobs:
+  build:
+    name: Upload Release Asset
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Build with Gradle
+        run: ./gradlew build
+      - name: Get Release Version
+        id: get_version
+        run: VERSION=$(./gradlew currentVersion -q -Prelease.quiet) && echo ::set-output name=VERSION::$VERSION
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1.0.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ steps.get_version.outputs.VERSION }}
+          draft: false
+          prerelease: false
+
+      - name: Upload Plugin (zip)
+        id: upload-release-asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }} # This pulls from the CREATE RELEASE step above, referencing it's ID to get its outputs object, which include a `upload_url`. See this blog post for more info: https://jasonet.co/posts/new-features-of-github-actions/#passing-data-to-future-steps
+          asset_path: ./build/libs/openssh-node-execution-${{ steps.get_version.outputs.VERSION }}.zip
+          asset_name: openssh-node-execution-${{ steps.get_version.outputs.VERSION }}.zip
+          asset_content_type: application/zip