Revert "Deprecate conda builds from builder (#2041)"

This reverts commit 3bc4faa.

Author: atalman

conda/activate.sh

@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+source activate /c/ProgramData/Miniconda3/Scripts/activate root

conda/build.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+
+# NOTE: This is a shim for next versions of the pytorch binary build workflows
+# TODO: Remove this once we fully move binary builds on master to GHA
+
+SCRIPTPATH="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+DESIRED_CUDA=${DESIRED_CUDA:-cpu} bash ${SCRIPTPATH}/build_pytorch.sh