Try installing ffmpeg with brew, to reliably get ffmpeg binary on App…

…le Silicon macos arm64

.github/workflows/test_and_deploy.yml

@@ -33,6 +33,16 @@ jobs:
         with:
           python-version: "3.x"
 
+      # 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'
+        run: |
+          brew update
+          brew install ffmpeg
+
       - name: Install dependencies
         run: |
           pip install --upgrade pip
@@ -47,9 +57,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # Upgrade to macos-latest when ffmpeg binaries are available for Mac arm-64
-        # https://github.com/imageio/imageio-ffmpeg/issues/71
-        platform: [ ubuntu-latest, windows-latest, macos-13 ]
+        # PySide currently unavailable for MacOS arm64, test with macos-13
+        platform: [ ubuntu-latest, windows-latest, macos-latest, macos-13 ]
         python-version: [ "3.9", "3.10", "3.11", "3.12" ]
 
     steps:

tox.ini

@@ -1,6 +1,6 @@
 # For more information about tox, see https://tox.readthedocs.io/en/latest/
 [tox]
-envlist = py{39,310,311,312}-{linux,macos,windows}-pyqt, py{39,310}-{linux,macos}-pyside
+envlist = py{39,310,311,312}-{linux,macos,windows}-pyqt, py{39,310}-{linux,macos-intel}-pyside
 
 [gh-actions]
 python =
@@ -12,7 +12,8 @@ python =
 [gh-actions:env]
 PLATFORM =
     ubuntu-latest: linux
-    macos-13: macos  # PySide currently unavailable for MacOS arm64
+    macos-latest: macos
+    macos-13: macos-intel  # PySide currently unavailable for MacOS arm64
     windows-latest: windows
 
 [testenv]
@@ -48,7 +49,7 @@ deps =
 # and https://github.com/napari/napari/issues/5884#issuecomment-1584160532
 # Windows PySide problems https://github.com/napari/napari/pull/6721/files
 # and https://github.com/napari/napari/pull/6711/
-[testenv:py{39,310}-{linux,macos}-pyside]
+[testenv:py{39,310}-{linux,macos-intel}-pyside]
 deps =
     napari[pyside2,testing]
     lxml_html_clean # should only be needed till napari 0.5.0