update README with instructions for flux rocky

Signed-off-by: vsoch <vsoch@users.noreply.github.com>

spack-rocky-libfabric/README.md

@@ -14,7 +14,13 @@ $ docker run -it ghcr.io/rse-ops/spack-rocky-libfabric:tag-8 bash
 ```
 
 The entrypoint sources spack at `/opt/spack-environment` so you don't need to worry
-about that. Flux should be on the path, so we can start a test instance:
+about that. Since we shouldn't run flux as root, let's create a shell as user "flux"
+
+```bash
+$ sudo -E -E HOME=/home/flux -u flux /bin/bash
+```
+
+Flux should be on the path, so we can then start a test instance:
 
 ```bash
 $ flux start --test-size=4
@@ -23,23 +29,29 @@ $ flux start --test-size=4
 And then try submitting a job!
 
 ```bash
-$ flux mini run hostname
+$ flux run hostname
+```
+```console
+633f87d7ebb8
 ```
-
 To see the versions of dependencies we have installed, spack to the rescue!
 Check out the spack lockfile (in the concrete specs section toward the top):
 
 ```bash
 $ cat /opt/spack-environment/spack.lock | less
 ```
 
-Here is a quick summary of versions (on Rocky Linux 8):
+Here is a quick summary of versions (on Rocky Linux 8) for stuff we care about:
 
 ```
 openmpi: 4.1.2
 gcc: 8.5.0
 libfabric: 1.14.0
-flux-core: 0.44.0 
+flux-core: 0.49.0 
 flux-pmix: 0.2.0
-flux-sched 0.25.0
+flux-sched 0.27.0
 ```
+
+Note that you could start the flux instance as root, and you'd see a jobtap
+plugin error (which largely can be ignored) but you really shouldn't be running
+as root :)