Thank you very much for this PR!

I don't think I was specific enough in the issue. That's my bad. Instead of embedding bash scripts in the Makefile, let's create a script in the hack directory so that it's easier to edit in the future. In the script we should specify directory names since we know which directories we care about. Something like this:

hack/embedded-resources.sh

#!/bin/bash

for dir in argo-cd gitea ingress-nginx; do
    ./hack/$dir/generate-manifests.sh;
    if [[ $? -ne 0 ]]; then
        echo "error running script: ./hack/$dir/generate-manifests.sh"
        exit 1
    fi
done

Then we can run it like so in Makefile:

.PHONY: embedded-resources
embedded-resources:
	./hack/embedded-resources.sh

LGTM. Thank you very much for this PR!