Add minor versioning to release 0.13 (pytorch#6334)

* Add minor versioning

* Rebuild m1 binarieswhen version.txt changes

Author: atalman

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

@@ -3,6 +3,7 @@ on:
   pull_request:
     paths:
       - .github/workflows/build-m1-binaries.yml
+      - version.txt
   push:
     branches:
       - nightly
@@ -73,7 +74,7 @@ jobs:
           conda create -yp ${ENV_NAME} python=${PY_VERS} numpy
           conda run -p ${ENV_NAME} python3 -mpip install torch --pre --extra-index-url=https://download.pytorch.org/whl/${CHANNEL}
           conda run -p ${ENV_NAME} python3 -mpip install dist/*.whl
-          # Test torch is importable, by changing cwd and running import commands
+          # 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)"

version.txt

@@ -1 +1 @@
-0.13.0a0
+0.13.1a0