Add pytorch-triton to small wheel (#1426)

Author: atalman

manywheel/build_cuda.sh

@@ -272,9 +272,14 @@ else
 fi
 
 # TODO: Remove me when Triton has a proper release channel
-if [[ $(uname) == "Linux" && -z "$PYTORCH_EXTRA_INSTALL_REQUIREMENTS" ]]; then
+if [[ $(uname) == "Linux" ]]; then
     TRITON_SHORTHASH=$(cut -c1-10 $PYTORCH_ROOT/.github/ci_commit_pins/triton.txt)
-    export PYTORCH_EXTRA_INSTALL_REQUIREMENTS="pytorch-triton==2.1.0+${TRITON_SHORTHASH}"
+
+    if [[ -z "$PYTORCH_EXTRA_INSTALL_REQUIREMENTS" ]]; then
+        export PYTORCH_EXTRA_INSTALL_REQUIREMENTS="pytorch-triton==2.1.0+${TRITON_SHORTHASH}"
+    else
+        export PYTORCH_EXTRA_INSTALL_REQUIREMENTS="${PYTORCH_EXTRA_INSTALL_REQUIREMENTS} | pytorch-triton==2.1.0+${TRITON_SHORTHASH}"
+    fi
 fi
 
 # builder/test.sh requires DESIRED_CUDA to know what tests to exclude