try with || true, with an explanation

scripts/setup.sh

@@ -18,8 +18,13 @@ function initialize {
     # install go ascii
 
     if [[ $install_go == true ]]; then
-        go mod init
-        go install github.com/guptarohit/asciigraph/cmd/asciigraph@latest 2>/dev/null
+        # || true here because this line technically fails with:
+            # no required module provides package github.com/guptarohit/asciigraph/cmd/asciigraph: go.mod file not found in current directory or any parent directory; see 'go help modules'
+        # the solution would be either to `go mod init` to create a go.mod file for this directory... but are not making a go package here so this doesn't seem appropriate
+        # the other solution would be to set the environment variable `go env -w GO111MODULE=auto`... but I can't seem to get any already-set value ahead of time reliably, and do not want to overwrite
+        # any user environment settings.
+        # So, we ignore this error for now, as functionally the asciigraph still is installed and works for Eco-CI
+        go install github.com/guptarohit/asciigraph/cmd/asciigraph@latest || true
         ascii_graph_path=$(go list -f '{{.Target}}' github.com/guptarohit/asciigraph/cmd/asciigraph)
     fi