workflows/version-check: Fix check for release candidates

[thieta]

LGTM with one small question.

.github/workflows/version-check.py

23

Is it unthinkable that we would ever do a rc for a non .0.0 version? It's fine for now but we could just match [0-9] or \d here as well I think.

[tstellar]

Handle release candidate tags for any release.

[thieta]

Very nice! LGTM

.github/workflows/version-check.py

 #!/usr/bin/python3
 
 from git import Repo
 import re
 import sys
 
 version = sys.argv[1]
 
 repo = Repo()
 
 tag = repo.git.describe(tags = True, abbrev=0)
-m = re.match('llvmorg-([0-9]+)\.([0-9]+)\.([0-9]+)', tag)
+m = re.match('llvmorg-([0-9]+)\.([0-9]+)\.([0-9]+)$', tag)
 
 if m:
     expected_major = m.group(1)
     expected_minor = m.group(2)
     expected_patch = int(m.group(3)) + 1
 else:
     # If the previous tag is llvmorg-X-init, then we should be at version X.0.0.
     m = re.match('llvmorg-([0-9]+)-init', tag)
     if not m:
+        # Check if this is an rc tag.
+        m = re.match('llvmorg-([0-9]+)\.0\.0-rc[0-9]+', tag)
+        if not m:
             print("error: Tag is not valid: ", tag)
             sys.exit(1)
     expected_major = m.group(1)
     expected_minor = 0
     expected_patch = 0
 
 expected_version = f"{expected_major}.{expected_minor}.{expected_patch}"
 
 m = re.match("[0-9]+\.[0-9]+\.[0-9]+", version)
 if not m: