Compare semver to latest tag

Author: Not-Nik

.github/workflows/semver.yml

@@ -36,8 +36,7 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Check semver
-        env:
-          BASE_REF: ${{ github.event.pull_request.base.ref || github.event.repository.default_branch }}
         run: |
+          LATEST_TAG_COMMIT=$(git rev-list --tags --max-count=1)
           # shellcheck disable=SC2086
-          cargo semver-checks --default-features --baseline-rev "origin/$BASE_REF"
+          cargo semver-checks --default-features --baseline-rev "$LATEST_TAG_COMMIT"