Append to driver .out file instead of overwriting

[maddenp-cu]

Synopsis

Update driver logic to append to runscript.<driver>.out file instead of overwriting it, preserving the output from multiple invocations of the driver, should those occur. As an example:

Before:

$ rm -rf /tmp/ungrib/
$ uw ungrib run -c config.yaml --cycle 2026-02-19T00
...
[2026-08-27T19:29:04]     INFO Running: ./runscript.ungrib >runscript.ungrib.out 2>&1
[2026-08-27T19:29:04]     INFO   in directory
[2026-08-27T19:29:04]     INFO     /tmp/ungrib
[2026-08-27T19:29:12]     INFO 20260219 00Z ungrib run via local execution: Ready
[2026-08-27T19:29:12]     INFO 20260219 00Z ungrib run: Ready
$ cat /tmp/ungrib/runscript.ungrib.out | wc -l
85
$ rm /tmp/ungrib/runscript.ungrib.done 
$ uw ungrib run -c config.yaml --cycle 2026-02-19T00
...
[2026-08-27T19:29:57]     INFO Running: ./runscript.ungrib >runscript.ungrib.out 2>&1
[2026-08-27T19:29:57]     INFO   in directory
[2026-08-27T19:29:57]     INFO     /tmp/ungrib
[2026-08-27T19:30:03]     INFO 20260219 00Z ungrib run via local execution: Ready
[2026-08-27T19:30:03]     INFO 20260219 00Z ungrib run: Ready
$ cat /tmp/ungrib/runscript.ungrib.out | wc -l
85

Note that runscript.ungrib.out was overwritten by the second driver invocation.

After:

$ rm -rf /tmp/ungrib/
$ uw ungrib run -c config.yaml --cycle 2026-02-19T00
...
[2026-08-27T19:31:17]     INFO Running: ./runscript.ungrib >>runscript.ungrib.out 2>&1
[2026-08-27T19:31:17]     INFO   in directory
[2026-08-27T19:31:17]     INFO     /tmp/ungrib
[2026-08-27T19:31:23]     INFO 20260219 00Z ungrib run via local execution: Ready
[2026-08-27T19:31:23]     INFO 20260219 00Z ungrib run: Ready
$ cat /tmp/ungrib/runscript.ungrib.out | wc -l
85
$ rm /tmp/ungrib/runscript.ungrib.done
$ uw ungrib run -c config.yaml --cycle 2026-02-19T00
...
[2026-08-27T19:36:29]     INFO Running: ./runscript.ungrib >>runscript.ungrib.out 2>&1
[2026-08-27T19:36:29]     INFO   in directory
[2026-08-27T19:36:29]     INFO     /tmp/ungrib
[2026-08-27T19:36:35]     INFO 20260219 00Z ungrib run via local execution: Ready
[2026-08-27T19:36:35]     INFO 20260219 00Z ungrib run: Ready
$ cat /tmp/ungrib/runscript.ungrib.out | wc -l
170

Here runscript.ungrib.out was appended to by the second driver invocation.

Type

• Enhancement (adds new functionality)

Impact

• This is a non-breaking change (existing functionality continues to work as expected)

Checklist

• I have added myself and any co-authors to the PR's Assignees list.
• I have reviewed the documentation and have made any updates necessitated by this change.
• Where helpful, I have written comments in this PR's Files changed view to assist reviewers.

[christinaholtNOAA]

Well, that seems like a heavy lift! 😉