Update build_package.yml

Add conda commands to create environment, install dependencies and then activate environment

Author: MagdaJuarez

.github/workflows/build_package.yml

@@ -21,7 +21,8 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip virtualenv
-          conda install --file environment.yml
+          conda env update --prune --file environment.yml 
+          conda activate coast
       - name: Shell Script Permissions
         run: |
           chmod +x *.sh