I am a bit confused by the logs I am seeing on GHA, where packaging starts but gets cancled right away:

Run pants --tag=ecr package ::
09:21:02.78 [INFO] Starting: Building dockerfile_parser.pex from <resource://pants.backend.docker.subsystems/dockerfile.lock>
09:21:02.92 [INFO] Canceled: Building dockerfile_parser.pex from <resource://pants.backend.docker.subsystems/dockerfile.lock>
09:21:05.25 [INFO] Starting: Building docker image ***.dkr.ecr.***.<http://amazonaws.com/test4:latest|amazonaws.com/test4:latest>
09:21:06.64 [WARN] Pants cannot infer owners for the following imports in the target airflow/dags/energy/owncloud/owncloud.py:../../../dags:
  * six (line: 20)
  * six.moves.urllib.parse (line: 21)
If you do not expect an import to be inferrable, add `# pants: no-infer-dep` to the import line. Otherwise, see <https://www.pantsbuild.org/v2.20/docs/troubleshooting#import-errors-and-missing-dependencies> for common problems.
09:21:07.13 [INFO] Starting: Building local_dists.pex
09:21:07.86 [INFO] Starting: Building 12 requirements for faas_repository.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, debugpy==1.6.0, flask==2.2.5, numpy==1.22.4, pyp... (112 characters truncated)
09:21:07.95 [INFO] Canceled: Building 12 requirements for faas_repository.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, debugpy==1.6.0, flask==2.2.5, numpy==1.22.4, pyp... (112 characters truncated)
09:21:07.95 [INFO] Starting: Building 12 requirements for faas_repository.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, debugpy==1.6.0, flask==2.2.5, numpy==1.22.4, pyp... (112 characters truncated)
09:21:08.13 [INFO] Starting: Building 5 requirements for faas_repository.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, geopandas==0.11.0, rasterio[s3]==1.2.6
09:21:08.45 [INFO] Canceled: Building local_dists.pex
09:21:08.45 [INFO] Starting: Building 12 requirements for faas_repository.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, debugpy==1.6.0, flask==2.2.5, numpy==1.22.4, pyp... (112 characters truncated)
09:21:22.33 [INFO] Canceled: Building 12 requirements for faas_repository.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, debugpy==1.6.0, flask==2.2.5, numpy==1.22.4, pyp... (112 characters truncated)
09:21:22.33 [INFO] Starting: Building 11 requirements for faas_repository.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, debugpy==1.6.0, flask==2.2.5, numpy==1.22.4, ras... (89 characters truncated)
09:21:22.38 [INFO] Canceled: Building 5 requirements for faas_repository.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, geopandas==0.11.0, rasterio[s3]==1.2.6
09:21:22.38 [INFO] Starting: Building 5 requirements for jobs.sentinel_image_layer/sentinel_image_layer.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, progressbar==2.5, ... (19 characters truncated)
09:21:22.43 [INFO] Canceled: Building 12 requirements for faas_repository.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, debugpy==1.6.0, flask==2.2.5, numpy==1.22.4, pyp... (112 characters truncated)
09:21:22.43 [INFO] Starting: Building 7 requirements for infra.apps.resources.snaplet/entrypoint.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, pandas==1.5.3, psycopg2-b... (53 characters truncated)
09:21:23.24 [INFO] Canceled: Building 11 requirements for faas_repository.pex from the lockfiles/default.lock resolve: aiobotocore[boto3]==2.6.0, boto3==1.28.17, botocore==1.31.17, debugpy==1.6.0, flask==2.2.5, numpy==1.22.4, ras... (89 characters truncated)

Is that a normal behaviour?

It might be if you have remote caching enabled - typically, the reason that the PEX build gets canceled is because the PEX containing the relevant packages has already been cached prior

Remote caching is enabled, thank you!