Add UPX to GitHub test-workflow

Author: dragetd

.github/workflows/test.yml

@@ -24,6 +24,12 @@ jobs:
       run: |
         sudo apt-get update -y
         sudo apt-get install -y libgtk-3-dev
+    - name: Install UPX (Linux)
+      if: matrix.platform == 'ubuntu-18.04'
+      run: sudo apt-get update && sudo apt-get install upx-ucl
+    - name: Install UPX (Windows)
+      if: matrix.platform == 'windows-2019'
+      run: choco install upx -y
     - name: Install goversioninfo
       shell: bash
       run: |