fix fetching milestones

Author: zhongkechen

.github/workflows/update-milestone-badge.yml

@@ -1,11 +1,10 @@
 name: Update Milestone Badge
 
 on:
-  pull_request:
   milestone:
     types: [created, edited, closed, deleted]
   schedule:
-    - cron: '0 6 * * *'  # Daily at 6am UTC
+    - cron: '0 6 * * *'
   workflow_dispatch:
 
 permissions:
@@ -25,23 +24,23 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          # Get the nearest open milestone sorted by due date
-          MILESTONE=$(gh api repos/${{ github.repository }}/milestones \
-            --jq 'sort_by(.due_on) | map(select(.state == "open" and .due_on != null)) | first')
-
-          LABEL="Next Milestone"
-          if [ -z "$MILESTONE" ] || [ "$MILESTONE" = "null" ]; then
-            MESSAGE="No milestone"
-            COLOR="lightgrey"
+          set -euo pipefail
+
+          # Fetch open milestones with due dates, pick the nearest one
+          TITLE=$(gh api repos/${{ github.repository }}/milestones \
+            --jq '[.[] | select(.state == "open" and .due_on != null)] | sort_by(.due_on) | .[0].title // empty')
+
+          if [ -z "$TITLE" ]; then
+            URL="https://img.shields.io/badge/Roadmap-No%20milestone-lightgrey"
           else
-            TITLE=$(echo "$MILESTONE" | jq -r '.title')
-            # URL-encode the title for shields.io
-            MESSAGE=$(python3 -c "import urllib.parse; print(urllib.parse.quote('$TITLE', safe=''))")
-            COLOR="blue"
+            # URL-encode the title using jq
+            ENCODED=$(echo -n "$TITLE" | jq -sRr @uri)
+            URL="https://img.shields.io/badge/Roadmap-${ENCODED}-blue"
           fi
 
           mkdir -p milestone
-          curl -s "https://img.shields.io/badge/${LABEL}-${MESSAGE}-${COLOR}" -o milestone/badge.svg
+          curl -sfL "$URL" -o milestone/badge.svg
+          echo "Badge generated for: ${TITLE:-No milestone}"
 
       - name: Commit and push
         run: |