bootloader: robustify uploader detection #996

Job	Run time
Scan for Board Targets	30s
Build Group [base-px4]	4m 32s
Build Group [nuttx-mro-0]	9m 16s
Build Group [nuttx-mro-1]	3m 33s
Build Group [nuttx-0]	6m 59s
Build Group [nuttx-ark-0]	6m 18s
Build Group [nuttx-ark-1]	4m 41s
Build Group [nuttx-holybro-0]	7m 49s
Build Group [nuttx-holybro-1]	3m 31s
Build Group [nuttx-px4-0]	7m 56s
Build Group [nuttx-px4-1]	11m 38s
Build Group [nuttx-px4-2]	12m 21s
Build Group [nuttx-px4-3]	5m 40s
Build Group [nuttx-matek]	5m 32s
Build Group [nuttx-cubepilot]	9m 24s
Build Group [nuttx-1]	6m 50s
Build Group [nuttx-nxp-0]	11m 9s
Build Group [nuttx-nxp-1]	1m 51s
Build Group [nuttx-2]	5m 44s
Build Group [nuttx-3]	6m 48s
Build Group [nuttx-cuav]	6m 44s
Build Group [nuttx-4]	5m 51s
Build Group [nuttx-5]	4m 12s
Build Group [aarch64-0]	1m 41s
Create Release and Upload Artifacts	0s
Upload Artifacts to S3	1m 42s
	2h 32m 12s

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