[YUNIKORN-1982] Enable manual triggering for GitHub CI

Closes: #142

Signed-off-by: Peter Bacsko <pbacsko@cloudera.com>
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 223808f..69b1e84 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -7,6 +7,7 @@
   push:
     branches:
       - master
+  workflow_dispatch: {}
 
 jobs:
   build: