Add GitHub Actions workflow for automated release builds

.github/workflows/release.yml

@@ -0,0 +1,61 @@
+name: Release Build
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up JDK
+      uses: actions/setup-java@v2
+      with:
+        java-version: '11'
+        distribution: 'adopt'
+
+    - name: Install NSIS
+      uses: joncloud/makensis-action@v4
+
+    - name: Build JAR
+      shell: bash
+      run: |
+        cd ATCS/packaging
+        chmod +x package.sh
+        ./package.sh -windows
+
+    - name: Create Installer
+      shell: bash
+      run: |
+        cd ATCS/packaging/Windows
+        makensis ATCS_Installer.nsi
+
+    - name: Get Version
+      id: get_version
+      shell: bash
+      run: |
+        VERSION=$(cat ATCS/packaging/ATCS_latest | sed 's/^v//')
+        echo "VERSION=$VERSION" >> $GITHUB_ENV
+
+    - name: Upload ZIP to Release
+      uses: actions/upload-release-asset@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        upload_url: ${{ github.event.release.upload_url }}
+        asset_path: ./ATCS/packaging/ATCS_${{ env.VERSION }}.zip
+        asset_name: ATCS_${{ env.VERSION }}.zip
+        asset_content_type: application/zip
+
+    - name: Upload Installer to Release
+      uses: actions/upload-release-asset@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        upload_url: ${{ github.event.release.upload_url }}
+        asset_path: ./ATCS/packaging/Windows/ATCS_v${{ env.VERSION }}_Setup.exe
+        asset_name: ATCS_v${{ env.VERSION }}_Setup.exe
+        asset_content_type: application/octet-stream