brew install ffmpeg on mac to fix CI tests

Temporary fix for issue imageio/imageio-ffmpeg#71

.github/workflows/test_and_deploy.yml

@@ -32,12 +32,26 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: 3.8
+
+        # Temporary fix for 'pip install imageio-ffmpeg'
+        # not including the FFMPEG binary on Apple Silicon macs
+        # This step can be removed when issue is fixed in imageio-ffmpeg
+        # https://github.com/imageio/imageio-ffmpeg/issues/71
+      - name: brew install ffmpeg
+        if: runner.os == 'macOS'
+        uses: artemnovichkov/[email protected]
+        run: |
+          brew update
+          brew install ffmpeg
+
       - name: Install dependencies
         run: |
           pip install --upgrade pip
           pip install tox
-      - name: Run task
+
+      - name: Run tox
         run: tox -e ${{ matrix.task }}
+
   test:
     name: ${{ matrix.platform }} py${{ matrix.python-version }}
     runs-on: ${{ matrix.platform }}
@@ -64,6 +78,17 @@ jobs:
           powershell gl-ci-helpers/appveyor/install_opengl.ps1
           if (Test-Path -Path "C:\Windows\system32\opengl32.dll" -PathType Leaf) {Exit 0} else {Exit 1}
 
+        # Temporary fix for 'pip install imageio-ffmpeg'
+        # not including the FFMPEG binary on Apple Silicon macs
+        # This step can be removed when issue is fixed in imageio-ffmpeg
+        # https://github.com/imageio/imageio-ffmpeg/issues/71
+      - name: brew install ffmpeg
+        if: runner.os == 'macOS'
+        uses: artemnovichkov/[email protected]
+        run: |
+          brew update
+          brew install ffmpeg
+
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip