strip double equals from conda version strings as unsupported by some…

… micromamba versions (#2201)

metaflow/plugins/pypi/micromamba.py

@@ -1,6 +1,7 @@
 import functools
 import json
 import os
+import re
 import subprocess
 import tempfile
 import time
@@ -23,6 +24,8 @@ def __init__(self, error):
 
 GLIBC_VERSION = os.environ.get("CONDA_OVERRIDE_GLIBC", "2.38")
 
+_double_equal_match = re.compile("==(?=[<=>!~])")
+
 
 class Micromamba(object):
     def __init__(self, logger=None):
@@ -101,7 +104,8 @@ def solve(self, id_, packages, python, platform):
                 cmd.append("--channel=%s" % channel)
 
             for package, version in packages.items():
-                cmd.append("%s==%s" % (package, version))
+                version_string = "%s==%s" % (package, version)
+                cmd.append(_double_equal_match.sub("", version_string))
             if python:
                 cmd.append("python==%s" % python)
             # TODO: Ensure a human readable message is returned when the environment