CI Activate env to prevent bnb import error (#1845)

All bitsandbytes nightly CI runs are currently failing with:

Run python3 -m bitsandbytes
/opt/conda/bin/python3: No module named bitsandbytes

This fix should hopefully solve this, but it's untested.

.github/workflows/nightly-bnb.yml

@@ -51,6 +51,7 @@ jobs:
  id: import
  if: always()
  run: |
+ source activate peft
  python3 -m bitsandbytes
  python3 -c "import bitsandbytes as bnb"
 
@@ -170,6 +171,8 @@ jobs:
  id: import
  if: always()
  run: |
+ source activate peft
+ python3 -m bitsandbytes
  python3 -c "import bitsandbytes as bnb"
 
  - name: Post to Slack