prepending ExecutorScriptSourcePath breaks using script with args without command

[MrFreezeex]

Summary

We use a script with an args with sh (and not a command). Our image has an entrypoint and exec the rest of the arguments with something like exec "$@".
The PR #4492 breaks these types of workflows (see the example below).

I don't know what should be the right behavior but executing the entrypoint before a script is pretty convenient. For instance, we use it to do some privileged actions and then we drop privileges before executing the workflow's script.

Diagnostics

What Kubernetes provider are you using? Baremetal

What version of Argo Workflows are you running? v2.12.2

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  name: test-args-script
spec:
  entrypoint: test
  templates:
  - name: test
    script:
      image: mrfreezeex/test-argow-script:v1
      args: [sh]
      source: |
        echo "This message won't be shown!"

My test image is built using these files :

Dockerfile :

FROM alpine

COPY entrypoint.sh entrypoint.sh

ENTRYPOINT entrypoint.sh
CMD echo hello

entrypoint.sh :

#!/bin/sh

exec "$@"

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