ci: skip upload step when api key is empty (usually happens for PR)

scripts/upload-packages.sh

@@ -4,11 +4,16 @@ set -ex
 
 cd "$(git rev-parse --show-toplevel)"
 
+if [ -z "$GITEA_API_KEY" ]; then
+  echo "GITEA_API_KEY is empty, skip upload."
+  exit 0
+fi
+
 URL_BASE="$DRONE_GITEA_SERVER/api/packages/${DRONE_REPO_NAMESPACE}/generic/${DRONE_REPO_NAME}-build"
 
 for ZIP_NAME in *.zip; do
-    UPLOAD_URL="${URL_BASE}/${DRONE_BUILD_NUMBER}/${ZIP_NAME}"
-    sha256sum "${ZIP_NAME}"
-    curl -sLifu "um-release-bot:$GITEA_API_KEY" -T "${ZIP_NAME}" "${UPLOAD_URL}"
-    echo "Uploaded to: ${UPLOAD_URL}"
+  UPLOAD_URL="${URL_BASE}/${DRONE_BUILD_NUMBER}/${ZIP_NAME}"
+  sha256sum "${ZIP_NAME}"
+  curl -sLifu "um-release-bot:$GITEA_API_KEY" -T "${ZIP_NAME}" "${UPLOAD_URL}"
+  echo "Uploaded to: ${UPLOAD_URL}"
 done