WIP: Add a basic GH workflow

Author: sgillespie

.github/workflows/update-params.yaml

@@ -0,0 +1,15 @@
+name: Update parameters
+
+on:
+  push: {}
+
+jobs:
+  update_parameters: 
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v4
+
+      - name: Update parameters
+        run: ./fetch-params.sh mainnet
+