These two runs of the container correctly download the SLCs in parallel. The earlier scene is correctly processed first as the reference scene regardless of the order on the command line.
$ docker run -it --env ... hyp3-gamma:latest ++process insar S1A_IW_SLC__1SSV_20150621T120220_20150621T120232_006471_008934_72D8 S1A_IW_SLC__1SSV_20150504T120217_20150504T120229_005771_00769E_EF9A
06/19/2024 03:45:50 PM - INFO - Downloading https://sentinel1.asf.alaska.edu/SLC/SA/S1A_IW_SLC__1SSV_20150621T120220_20150621T120232_006471_008934_72D8.zip
06/19/2024 03:45:50 PM - INFO - Downloading https://sentinel1.asf.alaska.edu/SLC/SA/S1A_IW_SLC__1SSV_20150504T120217_20150504T120229_005771_00769E_EF9A.zip
06/19/2024 03:46:11 PM - INFO - Unzipping S1A_IW_SLC__1SSV_20150621T120220_20150621T120232_006471_008934_72D8.zip
06/19/2024 03:46:12 PM - INFO - Unzipping S1A_IW_SLC__1SSV_20150504T120217_20150504T120229_005771_00769E_EF9A.zip
06/19/2024 03:46:22 PM - INFO -
Sentinel-1 differential interferogram creation program
06/19/2024 03:46:22 PM - INFO - Processing the vv polarization
06/19/2024 03:46:22 PM - INFO - Starting par_S1_SLC
06/19/2024 03:46:22 PM - INFO - Downloading orbit file for S1A_IW_SLC__1SSV_20150504T120217_20150504T120229_005771_00769E_EF9A.SAFE
$ docker run -it --env ... hyp3-gamma:latest ++process insar S1A_IW_SLC__1SSV_20150504T120217_20150504T120229_005771_00769E_EF9A S1A_IW_SLC__1SSV_20150621T120220_20150621T120232_006471_008934_72D8
06/19/2024 03:48:22 PM - INFO - Downloading https://sentinel1.asf.alaska.edu/SLC/SA/S1A_IW_SLC__1SSV_20150504T120217_20150504T120229_005771_00769E_EF9A.zip
06/19/2024 03:48:22 PM - INFO - Downloading https://sentinel1.asf.alaska.edu/SLC/SA/S1A_IW_SLC__1SSV_20150621T120220_20150621T120232_006471_008934_72D8.zip
06/19/2024 03:48:44 PM - INFO - Unzipping S1A_IW_SLC__1SSV_20150621T120220_20150621T120232_006471_008934_72D8.zip
06/19/2024 03:48:45 PM - INFO - Unzipping S1A_IW_SLC__1SSV_20150504T120217_20150504T120229_005771_00769E_EF9A.zip
06/19/2024 03:48:54 PM - INFO -
Sentinel-1 differential interferogram creation program
06/19/2024 03:48:54 PM - INFO - Processing the vv polarization
06/19/2024 03:48:54 PM - INFO - Starting par_S1_SLC
06/19/2024 03:48:54 PM - INFO - Downloading orbit file for S1A_IW_SLC__1SSV_20150504T120217_20150504T120229_005771_00769E_EF9A.SAFE
These two runs of the container correctly download the SLCs in parallel. The earlier scene is correctly processed first as the reference scene regardless of the order on the command line.