fix

Author: linkdata

.github/workflows/self-test.yml

@@ -94,6 +94,7 @@ jobs:
       - name: Run action in tag-triggered mode
         uses: ./action-src
         env:
+          GITHUB_HEAD_REF: ""
           GITCOVERAGE_REF_TYPE: tag
           GITCOVERAGE_REF_NAME: v-test
           GITCOVERAGE_REF: refs/tags/v-test
@@ -118,6 +119,7 @@ jobs:
         continue-on-error: true
         uses: ./action-src
         env:
+          GITHUB_HEAD_REF: ""
           GITCOVERAGE_REF_TYPE: tag
           GITCOVERAGE_REF_NAME: v-detached
           GITCOVERAGE_REF: refs/tags/v-detached