HPCC-25553 Correct buildtype to build_type

Signed-off-by: Jake Smith <jake.smith@lexisnexisrisk.com>

.github/workflows/build-and-publish-debug.yml

@@ -25,5 +25,5 @@ jobs:
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
-          buildtype: Debug
+          build_type: Debug