Temporarily target dmr/cross-repo-ci-merge-sha for testing

Author: dannyroberts

.github/workflows/build.yml

@@ -100,7 +100,7 @@ jobs:
                 owner,
                 repo,
                 workflow_id: process.env.WORKFLOW_FILE,
-                ref: 'master',
+                ref: 'dmr/cross-repo-ci-merge-sha',
                 inputs: {
                   commcare_core_sha: process.env.MERGE_SHA,
                   commcare_core_pr: process.env.COMMCARE_CORE_PR,