add commit log to release tag script (#584)

this is intended to provide more context to the releaser when they are
running the script

Makefile.release

@@ -5,7 +5,6 @@
 __tag-release-candidate:
 	@echo "+++ Tagging release candidate"
 	@./scripts/fail-if-dirty-repo.sh # Fail if the repo is dirty
-	@echo "+++ Tagging commit $(shell git rev-parse HEAD) with CS_VERSION=$(CS_VERSION)"
 	CS_VERSION="$(CS_VERSION)" ./scripts/tag-release-candidate.sh
 
 .PHONY: __promote-rc-tag

scripts/tag-release-candidate.sh

@@ -102,6 +102,15 @@ echo "+++ Most recent RC of version $CS_VERSION: $RC"
 NEXT_RC=$(increment_rc_of_semver "$RC")
 echo "+++ Incremented RC.  NEXT_RC: $NEXT_RC"
 
+# Log main/release branch for more context
+if [[ "${branch}" == "main" ]]; then
+  git log --oneline --graph -30 "${remote_sha}"
+else
+  git fetch "${REMOTE}" main > /dev/null
+  main_sha=$(git rev-parse FETCH_HEAD)
+  git log --oneline --graph -30 "${main_sha}" "${remote_sha}"
+fi
+
 read -rp "This will tag commit ${remote_sha} from branch ${branch} as ${NEXT_RC} - Proceed (yes/no)? " choice
 case "${choice}" in
   yes) ;;