Correct version parsing for singularity-ce. (#326)

Community edition of singularity starting version 3.8.0 (https://github.com/sylabs/singularity/releases?page=4) changes its name to `singularity-ce`. This commit adds support for version strings that looks like `singularity-ce version 3.10.0`.

runners/mlcube_singularity/mlcube_singularity/singularity_client.py

@@ -142,6 +142,11 @@ def init(self, force: bool = False) -> None:
                     Runtime.SINGULARITY,
                     version_string[20:].strip(),
                 )
+            elif version_string.startswith("singularity-ce version "):
+                runtime, version_string = (
+                    Runtime.SINGULARITY,
+                    version_string[23:].strip(),
+                )
             elif version_string.startswith("apptainer version "):
                 runtime, version_string = Runtime.APPTAINER, version_string[18:].strip()
             elif "/" in version_string:  # Handle old stuff like "x.y.z-pull/123-0a5d"