Add test step for gstreamer and ffmpeg installation

Add testing step to install gstreamer and ffmpeg.

Author: zenfty

.github/workflows/build.yml

@@ -49,6 +49,16 @@ jobs:
 
           # sanity check
           brew doctor || true
+
+      - name: test
+        run: |
+          brew install gstreamer
+          echo "gstreamer libs"
+          ls $(brew --prefix gstreamer)
+          
+          brew install ffmpeg@7
+          echo "ffmpeg libs"
+          ls $(brew --prefix ffmpeg@7)
           
       - name: Install MacPorts
         run: |