remove files before discovering

.github/workflows/update-sources.yaml

···
           "uses": "DeterminateSystems/magic-nix-cache-action@main"
         },
         {
+          "run": "rm -rf ./dev/community/discovered/"
+        },
+        {
           "run": "nix develop --accept-flake-config --override-input dendrix . --print-build-logs ./dev -c pins update"
         },
         {
···
   "name": "update sources",
   "on": {
     "repository_dispatch": {},
-    "schedule": {
-      "cron": "0 0 * * *"
-    },
+    "schedule": [
+      {
+        "cron": "0 5 * * *"
+      }
+    ],
     "workflow_call": {},
     "workflow_dispatch": {}
   },

dev/modules/gh-update-sources.nix

···
               workflow_call = { };
               workflow_dispatch = { };
               repository_dispatch = { };
-              schedule = [{
-                cron = "0 5 * * *";
-              }];
+              schedule = [
+                {
+                  cron = "0 5 * * *";
+                }
+              ];
             };
             permissions = {
               contents = "write";
···
               environment.url = "\${{steps.update.outputs.pull-request-url}}";
               runs-on = "ubuntu-latest";
               steps = (import ./_gh-provision-nix.nix) ++ [
+                {
+                  run = "rm -rf ./dev/community/discovered/";
+                }
                 {
                   run = "nix develop --accept-flake-config --override-input dendrix . --print-build-logs ./dev -c pins update";
                 }