ADD: GitHub release action

.github/workflows/release.yml

@@ -0,0 +1,34 @@
+name: build-release
+
+on:
+  workflow_dispatch:
+  release:
+    types: [released]
+
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build-lin:
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Install Lazarus
+      run: sudo apt install lazarus
+
+    - name: Install GTK library 
+      run: sudo apt install libgtk2.0-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
+
+    - name: Checkout source
+      uses: actions/checkout@v2
+
+    - name: Build packages
+      run: ./build.sh
+
+    - name: Upload binaries to release
+      uses: svenstaro/upload-release-action@v2
+      with:
+        file: plugins-*.tar.gz
+        tag: ${{ github.ref }}
+        overwrite: true
+        file_glob: true