Set group permissions on whispercpp app folder #918

Job	Run time
model-servers-buid-and-push (llamacpp_python, granite, base, llamacpp_python, linux/amd64,linux/a...	15m 8s
model-servers-buid-and-push (llamacpp-python-cuda, granite, cuda, llamacpp_python, linux/amd64,li...	16m 41s
model-servers-buid-and-push (llamacpp-python-vulkan-amd, granite, vulkan/amd64, llamacpp_python, ...	2m 25s
model-servers-buid-and-push (llamacpp-python-vulkan-arm, granite, vulkan/arm64, llamacpp_python, ...	16m 22s
model-servers-buid-and-push (whispercpp, whisper-small, base, whispercpp, linux/amd64,linux/arm64...	12m 16s
model-servers-buid-and-push (object_detection_python, facebook-detr-resnet-101, base, object_dete...	8m 45s
	1h 11m 37s

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