fix(release): handle missing previous tag in release workflow

.gitea/workflows/release.yml

@@ -63,7 +63,7 @@ jobs:
           TAG="${{ github.event.inputs.tag || github.ref_name }}"
           API="${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/releases"
 
-          PREV_TAG=$(git tag --sort=-version:refname | grep -v "^${TAG}$" | head -1)
+          PREV_TAG=$(git tag --sort=-version:refname | { grep -v "^${TAG}$" || true; } | head -1)
           if [ -n "$PREV_TAG" ]; then
             RANGE="${PREV_TAG}..${TAG}"
           else