[fbsync] add ffmpeg to Linux CPU and GPU unittest workflows (#7295)

Reviewed By: vmoens

Differential Revision: D44416636

fbshipit-source-id: a6e58468d2f0d1b093e7468f11d791e137008867

Author: NicolasHug

.github/workflows/test-linux-cpu.yml

@@ -39,7 +39,7 @@ jobs:
         fi
 
         # Create Conda Env
-        conda create -yp ci_env python="${PYTHON_VERSION}" numpy libpng jpeg scipy
+        conda create -yp ci_env python="${PYTHON_VERSION}" numpy libpng jpeg scipy 'ffmpeg<4.3'
         conda activate /work/ci_env
 
         # Install PyTorch, Torchvision, and testing libraries

.github/workflows/test-linux-gpu.yml

@@ -43,7 +43,7 @@ jobs:
         fi
 
         # Create Conda Env
-        conda create -yp ci_env python="${PYTHON_VERSION}" numpy libpng jpeg scipy
+        conda create -yp ci_env python="${PYTHON_VERSION}" numpy libpng jpeg scipy 'ffmpeg<4.3'
         conda activate /work/ci_env
 
         # Install PyTorch, Torchvision, and testing libraries