[conda] use pip to install the package [skip ci]

5 jobs for master in 4 minutes and 55 seconds (queued for 8 seconds)
Name Stage Failure
failed
build_macos_intel_38 Build
    raise subprocess.CalledProcessError(proc.returncode, _args)
subprocess.CalledProcessError: Command '['/bin/bash', '-o', 'errexit', '/Users/gitlab/builds/nrU4yQP1/0/bob/bob.db.mnist/miniconda/conda-bld/bob.db.mnist_1633482595548/work/conda_build.sh']' returned non-zero exit status 2.
Uploading artifacts for failed job
Uploading artifacts...
Runtime platform
arch=amd64 os=darwin pid=33760 revision=e0218c92 version=14.3.2
WARNING: coverage.xml: no matching files
ERROR: No files to upload
Cleaning up project directory and file based variables
ERROR: Job failed: exit status 1

failed
build_linux_38 Build
  File "/scratch/builds/bob/bob.db.mnist/miniconda/lib/python3.9/site-packages/conda_build/utils.py", line 392, in _func_defaulting_env_to_os_environ
raise subprocess.CalledProcessError(proc.returncode, _args)
subprocess.CalledProcessError: Command '['/bin/bash', '-o', 'errexit', '/scratch/builds/bob/bob.db.mnist/miniconda/conda-bld/bob.db.mnist_1633482548336/work/conda_build.sh']' returned non-zero exit status 2.
Uploading artifacts for failed job
Uploading artifacts...
WARNING: coverage.xml: no matching files
ERROR: No files to upload
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1