feat: conda or mamba-based installation script

Author: guicho271828

.bashrc

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+
+conda activate mellea

conda/environment.yml

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+
+name: mellea
+channels:
+  - conda-forge
+dependencies:
+  - python=3.12                 # note: at the time of writing, xformer (< vllm) has a broken wheel for 3.13. https://github.com/facebookresearch/xformers/issues/740#issuecomment-2753869337
+  - uv

conda/install.sh

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+#!/bin/bash -xe
+
+conda=""
+if $(which mamba)
+then
+    conda=$(which mamba)
+fi
+if $(which conda)
+then
+    conda=$(which conda)
+fi
+if [ -z $conda ]
+then
+    echo "Error: conda or mamba is not installed or is not in the PATH."
+fi
+
+echo "using $conda for environment setup"
+
+$conda env remove -y -n mellea || true
+$conda env create -f environment.yml
+
+$conda run -n mellea uv pip install -e .[all] --group dev