Revert "Remove 8.17 from dev branches"

This reverts commit f0bb49eb369ce32b9969b419b1cc2698600669a9.

branches.json

@@ -16,6 +16,9 @@
     {
       "branch": "8.18"
     },
+    {
+      "branch": "8.17"
+    },
     {
       "branch": "7.17"
     }