Local setup using Conda

[nopperl]

It might make sense to add the option of using Conda to setup the local dev environment. It should make it easier for contributors as it's cross-platform and doesn't require root access. To save people who want to do this the hassle of finding all the packages, here's the environment.yaml I used:

name: tabby
channels:
  - conda-forge
  - defaults
  - nvidia/label/cuda-11.8.0
dependencies:
  - cmake>=3.18
  - compilers
  - cuda
  - git
  - gxx=11
  - libopenblas
  - openssl
  - pip
  - protobuf
  - python
  - rust
  - sysroot_linux-64>=2.17

(The cuda package can be removed if CUDA support is not required.)

The Conda env can then be created and activated using:

conda create -f environment.yaml
conda activate tabby

Note: the following env vars need to be set when building tabby:

OPENSSL_INCLUDE_DIR=$CONDA_PREFIX/include/openssl
OPENSSL_LIB_DIR=$CONDA_PREFIX/lib
LD_LIBRARY_PATH=$CONDA_PREFIX/lib/stubs:$CONDA_PREFIX/lib
LIBRARY_PATH=$CONDA_PREFIX/lib/stubs:$CONDA_PREFIX/lib

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