[DO NOT DELETE OR MERGE] Nightly build

[ezyang]

See pytorch/pytorch#26817 for what this does

FB only: Chronos job page: https://our.internmc.facebook.com/intern/chronos/job/?jobname=torchvision%20nightly%20trigger&smc=chronos_gp_admin_client (click "Run Now" to manually trigger a nightly)

[codecov-io]

Codecov Report

Merging #1449 into master will increase coverage by 4.70%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1449      +/-   ##
==========================================
+ Coverage   65.93%   70.63%   +4.70%     
==========================================
  Files          90       94       +4     
  Lines        7074     8004     +930     
  Branches     1076     1276     +200     
==========================================
+ Hits         4664     5654     +990     
+ Misses       2102     1945     -157     
- Partials      308      405      +97     

Impacted Files	Coverage Δ
torchvision/datasets/caltech.py	20.93% <ø> (-0.91%)	⬇️
torchvision/datasets/cifar.py	75.94% <ø> (-2.22%)	⬇️
torchvision/datasets/cityscapes.py	80.00% <ø> (ø)
torchvision/datasets/flickr.py	24.67% <ø> (ø)
torchvision/datasets/folder.py	85.18% <ø> (+3.13%)	⬆️
torchvision/datasets/hmdb51.py	28.33% <ø> (+0.33%)	⬆️
torchvision/datasets/kinetics.py	40.00% <ø> (+2.50%)	⬆️
torchvision/datasets/lsun.py	20.43% <ø> (-4.06%)	⬇️
torchvision/datasets/mnist.py	54.33% <ø> (+2.39%)	⬆️
torchvision/datasets/omniglot.py	31.91% <ø> (-1.42%)	⬇️
... and 124 more

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[atalman]

closing this in favor of https://github.com/pytorch/test-infra/actions/workflows/trigger_nightly.yml