[M1] Install "jpeg<=9b" rather than OpenJpeg (#6122)

Explicitly set PATH to point to `conda` binary, otherwise libjpeg detection logic does not work
Pin libjpeg to the same version on x86 and m1
Add simple tests that jpeg can be decoded by a generated wheel

.github/workflows/build-m1-binaries.yml

@@ -24,11 +24,13 @@ jobs:
           PY_VERS: ${{ matrix.py_vers }}
         run: |
           . ~/miniconda3/etc/profile.d/conda.sh
+          # Needed for JPEG library detection as setup.py detects conda presence by running `shlex.which('conda')`
+          export PATH=~/miniconda3/bin:$PATH
           set -ex
           . packaging/pkg_helpers.bash
           setup_build_version
           WHL_NAME=torchvision-${BUILD_VERSION}-cp${PY_VERS/.}-cp${PY_VERS/.}-macosx_11_0_arm64.whl
-          conda create -yp ${ENV_NAME} python=${PY_VERS} numpy libpng openjpeg wheel pkg-config
+          conda create -yp ${ENV_NAME} python=${PY_VERS} numpy libpng "jpeg<=9b" wheel pkg-config
           conda run -p ${ENV_NAME} python3 -mpip install torch --pre --extra-index-url=https://download.pytorch.org/whl/nightly
           conda run -p ${ENV_NAME} python3 -mpip install delocate
           conda run -p ${ENV_NAME} python3 setup.py bdist_wheel
@@ -49,6 +51,7 @@ jobs:
           # Test torch is importable, by changing cwd and running import commands
           conda run --cwd /tmp -p ${ENV_NAME} python3 -c "import torchvision;print('torchvision version is ', torchvision.__version__)"
           conda run --cwd /tmp -p ${ENV_NAME} python3 -c "import torch;import torchvision;print('Is torchvision useable?', all(x is not None for x in [torch.ops.image.decode_png, torch.ops.torchvision.roi_align]))"
+          conda run --cwd /tmp -p ${ENV_NAME} python3 -c "import torchvision;print(torchvision.io.read_image('${PWD}/gallery/assets/dog1.jpg').shape)"
           conda env remove -p ${ENV_NAME}
       - name: Upload wheel to GitHub
         uses: actions/upload-artifact@v3