Update base user environment to mambaforge 22.11.1-4

shift some duplicated code into utility functions and constants

tests/test_conda.py

@@ -2,6 +2,7 @@
 Test conda commandline wrappers
 """
 from tljh import conda
+from tljh import installer
 import os
 import pytest
 import subprocess
@@ -13,25 +14,20 @@ def prefix():
     """
     Provide a temporary directory with a mambaforge conda environment
     """
-    # see https://github.com/conda-forge/miniforge/releases
-    mambaforge_version = "4.10.3-7"
-    if os.uname().machine == "aarch64":
-        installer_sha256 = (
-            "ac95f137b287b3408e4f67f07a284357b1119ee157373b788b34e770ef2392b2"
-        )
-    elif os.uname().machine == "x86_64":
-        installer_sha256 = (
-            "fc872522ec427fcab10167a93e802efaf251024b58cc27b084b915a9a73c4474"
-        )
-    installer_url = "https://github.com/conda-forge/miniforge/releases/download/{v}/Mambaforge-{v}-Linux-{arch}.sh".format(
-        v=mambaforge_version, arch=os.uname().machine
-    )
+    machine = os.uname().machine
+    installer_url, checksum = installer._mambaforge_url()
     with tempfile.TemporaryDirectory() as tmpdir:
         with conda.download_miniconda_installer(
-            installer_url, installer_sha256
+            installer_url, checksum
         ) as installer_path:
             conda.install_miniconda(installer_path, tmpdir)
-        conda.ensure_conda_packages(tmpdir, ["conda==4.10.3"])
+        conda.ensure_conda_packages(
+            tmpdir,
+            [
+                f"conda=={installer.MAMBAFORGE_CONDA_VERSION}",
+                f"mamba=={installer.MAMBAFORGE_MAMBA_VERSION}",
+            ],
+        )
         yield tmpdir