Add delete step

Author: tomwhite

.github/workflows/build-runtime.yml

@@ -52,6 +52,9 @@ jobs:
           mkdir -p ~/.lithops
           cp .lithops/config ~/.lithops/config
 
+      - name: Delete existing runtime
+        run: lithops runtime delete ${{ env.RUNTIME_NAME }} -b aws_lambda --yes || true
+
       - name: Build runtime
         run: lithops runtime build ${{ env.RUNTIME_NAME }} -b aws_lambda -f Dockerfile