fix(ci): add https:// to cleanup API URLs

REGISTRY env var is just the hostname without scheme. Docker actions
handle this automatically, but curl needs the full URL.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/build.yml

@@ -62,7 +62,7 @@ jobs:
           page=1
           while true; do
             versions=$(curl -sf -H "Authorization: token $TOKEN" \
-              "${{ env.REGISTRY }}/api/v1/packages/wylab?type=container&q=nanobot&limit=50&page=$page")
+              "https://${{ env.REGISTRY }}/api/v1/packages/wylab?type=container&q=nanobot&limit=50&page=$page")
             count=$(echo "$versions" | jq length)
             [ "$count" = "0" ] && break
             echo "$versions" | jq -c '.[]' | while read -r pkg; do
@@ -75,7 +75,7 @@ jobs:
                 id=$(echo "$pkg" | jq -r '.id')
                 echo "Deleting nanobot:$ver (id=$id, created=$created)"
                 curl -sf -X DELETE -H "Authorization: token $TOKEN" \
-                  "${{ env.REGISTRY }}/api/v1/packages/wylab/container/nanobot/$ver" || true
+                  "https://${{ env.REGISTRY }}/api/v1/packages/wylab/container/nanobot/$ver" || true
               fi
             done
             [ "$count" -lt 50 ] && break