Update main.yml

Signed-off-by: Sambhav Kothari <[email protected]>

Author: sambhav

.github/workflows/main.yml

@@ -25,6 +25,8 @@ jobs:
         run: sudo apt-get install make curl jq
       - name: Install pack
         uses: buildpacks/github-actions/[email protected]
+        with:
+          pack-version: '0.28.0'
       - name: Test
         run: make test
         env: