add environment for cellxgene

cxg_env.yml

+name: cellxgene                                                               
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - _libgcc_mutex=0.1=main
+  - _openmp_mutex=5.1=1_gnu
+  - ca-certificates=2024.6.2=hbcca054_0
+  - certifi=2024.6.2=pyhd8ed1ab_0
+  - ld_impl_linux-64=2.38=h1181459_1
+  - libffi=3.4.4=h6a678d5_1
+  - libgcc-ng=11.2.0=h1234567_1
+  - libgomp=11.2.0=h1234567_1
+  - libnsl=2.0.0=h7f98852_0
+  - libstdcxx-ng=11.2.0=h1234567_1
+  - ncurses=6.4=h6a678d5_0
+  - openssl=1.1.1w=h7f8727e_0
+  - parallel=20240322=ha770c72_0
+  - perl=5.32.1=2_h7f98852_perl5
+  - pip=22.3.1=py37h06a4308_0
+  - python=3.7.16=h7a1cb2a_0
+  - readline=8.2=h5eee18b_0
+  - setuptools=65.6.3=py37h06a4308_0
+  - sqlite=3.45.3=h5eee18b_0
+  - tk=8.6.14=h39e8969_0
+  - wheel=0.38.4=py37h06a4308_0
+  - xz=5.4.6=h5eee18b_1
+  - zlib=1.2.13=h5eee18b_1
+  - pip:
+      - aniso8601==9.0.1
+      - anndata==0.8.0
+      - boto3==1.33.13
+      - botocore==1.33.13
+      - brotli==1.1.0
+      - cellxgene==1.1.2
+      - charset-normalizer==3.3.2
+      - click==8.1.7
+      - flask==2.2.5
+      - flask-compress==1.15
+      - flask-cors==4.0.1
+      - flask-restful==0.3.10
+      - flask-server-timing==0.1.2
+      - flask-talisman==1.1.0
+      - flatbuffers==1.12
+      - flatten-dict==0.4.2
+      - fsspec==0.7.4
+      - gunicorn==22.0.0
+      - h5py==3.8.0
+      - idna==3.7
+      - importlib-metadata==6.7.0
+      - itsdangerous==2.1.2
+      - jinja2==3.1.4
+      - jmespath==1.0.1
+      - llvmlite==0.39.1
+      - markupsafe==2.1.5
+      - natsort==8.4.0
+      - numba==0.56.4
+      - numpy==1.21.6
+      - packaging==24.0
+      - pandas==1.3.5
+      - python-dateutil==2.9.0.post0
+      - pytz==2024.1
+      - pyyaml==6.0.1
+      - requests==2.31.0
+      - s3fs==0.4.2
+      - s3transfer==0.8.2
+      - scipy==1.7.3
+      - six==1.16.0
+      - typing-extensions==4.7.1
+      - urllib3==1.26.19
+      - werkzeug==2.2.3
+      - zipp==3.15.0
+      - zstandard==0.21.0
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