ATR-28398: Fix for Run-2 RDOtoRDOTrigger running on the grid

!67316 (merged) has missed in one place the working directory structure for transforms running on the grid.
The workdir is /srv/workDir, where my_setupATLAS.sh is created.
Before calling this script, the directory is changed to /srv (needed for launching a nested container) and of course "./my_setupATLAS.sh" doesn't work from there. This MR changes to the absolute path of my_setupATLAS.sh for launching the container.
Tested with a grid-like parent container setup (missed this during testing last time):

setupATLAS -c el9 -e "-C"
asetup Athena,main,latest
mkdir workDir && cd workDir
ATHENA_CORE_NUMBER=0 Reco_tf.py  --AMIConfig q443 --imf False --CA all:True RDOtoRDOTrigger:False --conditionsTag default:OFLCOND-MC16-SDR-RUN2-11 RDOtoRDOTrigger:OFLCOND-MC16-SDR-RUN2-08-02 --maxEvents 1

This merge request affects 1 package:

• Tools/PyJobTransforms

This merge request affects 1 file:

• Tools/PyJobTransforms/python/trfExe.py

added Tools main review-pending-level-1 labels

WARNING: big files (>100K) are found in the changeset

116K in file Tools/PyJobTransforms/python/trfExe.py

CI Result SUCCESS (hash ad1e281c)

	Athena	AthSimulation	AthGeneration
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 1727]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 4a25297c