open-clade-counts: Skip trigger_model_runs job

Skip the `trigger_model_runs` job due to low sequence counts.
This only disables the automated model runs, we can still manually
trigger the run-models workflow for open/GenBank data. We can revisit
whether to restart it when we do a review of sequence count cutoffs.

.github/workflows/update-ncov-open-clade-counts.yaml

@@ -57,7 +57,9 @@ jobs:
 
   trigger_model_runs:
     needs: [open_clade_counts]
-    if: ${{ !github.event.inputs.trial_name }}
+    # Disable the run-model workflow due to low sequence counts
+    # <https://github.com/nextstrain/forecasts-ncov/issues/119>
+    if: false
     runs-on: ubuntu-latest
     steps:
       - run: gh workflow run run-models.yaml --repo nextstrain/forecasts-ncov -f data_provenance=open