Change to py3.10 and use mamba instead of conda for install for speed

.github/workflows/build.yaml

@@ -16,10 +16,12 @@ jobs:
 
       - uses: conda-incubator/setup-miniconda@v2
         with:
-          python-version: 3.8
+          python-version: "3.10"
+          mamba-version: "*"
           channels: conda-forge,defaults
           channel-priority: strict
           show-channel-urls: true
+          activate-environment: test
 
       - name: Test Simbad URL is contactable
         shell: bash -l {0}
@@ -30,7 +32,7 @@ jobs:
         # Might be quicker to install rubin-env plus any necessary additions.
         shell: bash -l {0}
         run: |
-          conda install -y -q numpy>1.15 scipy matplotlib>3.1 pandas llvmlite numba astropy>=3.2 photutils>=0.7 astroquery coloredlogs scikit-image h5py emcee tqdm mpi4py schwimmbad iminuit>=2 coverage>=3.6 configparser coveralls deprecated pyyaml nose getCalspec
+          mamba install -y -q numpy>1.15 scipy matplotlib>3.1 pandas llvmlite numba astropy>=3.2 photutils>=0.7 astroquery coloredlogs scikit-image h5py emcee tqdm mpi4py schwimmbad iminuit>=2 coverage>=3.6 configparser coveralls deprecated pyyaml nose getCalspec
 
       - name: List installed packages
         shell: bash -l {0}