Do not fail on non-existing prev tag

Author: edburns

.github/workflows/java-publish-maven.yml

@@ -205,9 +205,11 @@ jobs:
           RELEASE_NOTES=$(envsubst < $GITHUB_WORKSPACE/.github/workflows/java.notes.template)
 
           # Get the previous tag for generating notes
+          # grep returns exit 1 when no lines match (first release), so
+          # append "|| true" to prevent pipefail from aborting the script.
           PREV_TAG=$(git tag --list 'java/v*' --sort=-version:refname \
             | grep -Fxv "${CURRENT_TAG}" \
-            | head -n 1)
+            | head -n 1 || true)
 
           echo "Current tag: ${CURRENT_TAG}"
           echo "Previous tag: ${PREV_TAG}"