**fix(ci):** improve version bump script for robustness and compatibility

- Handle empty tag results gracefully using fallback in `grep`
- Use `${GITHUB_ENV:-$GITEA_ENV}` for environment variable assignment to ensure broader compatibility

.gitea/workflows/release.yml

@@ -62,7 +62,7 @@ jobs:
 
       - name: Compute new version
         run: |
-          LATEST=$(git tag --sort=-version:refname | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' | head -1)
+          LATEST=$(git tag --sort=-version:refname | { grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' || true; } | head -1)
           LATEST=${LATEST:-v0.0.0}
           VERSION="${LATEST#v}"
           MAJOR=$(echo "$VERSION" | cut -d. -f1)
@@ -74,7 +74,7 @@ jobs:
             patch) PATCH=$((PATCH + 1)) ;;
           esac
           NEW_VERSION="v${MAJOR}.${MINOR}.${PATCH}"
-          echo "NEW_VERSION=${NEW_VERSION}" >> $GITEA_ENV
+          echo "NEW_VERSION=${NEW_VERSION}" >> "${GITHUB_ENV:-$GITEA_ENV}"
           echo "Bumping ${LATEST} → ${NEW_VERSION}"
 
       - name: Create and push tag