Bring back skumaran-ubuntu-x86_64 worker (#602)

This reverts commit abeb9a6.

Author: orsenthil

master/custom/builders.py

@@ -221,6 +221,8 @@
     ("AMD64 Fedora Rawhide LTO", "cstratak-fedora-rawhide-x86_64", LTONonDebugUnixBuild),
     ("AMD64 Fedora Rawhide LTO + PGO", "cstratak-fedora-rawhide-x86_64", LTOPGONonDebugBuild),
 
+    ("AMD64 Ubuntu", "skumaran-ubuntu-x86_64", UnixBuild),
+
     ("AMD64 Arch Linux VintageParser", "pablogsal-arch-x86_64", UnixVintageParserBuild),
 
     ("AMD64 RHEL8 FIPS No Builtin Hashes", "cstratak-RHEL8-fips-x86_64", RHEL8NoBuiltinHashesUnixBuild),

master/custom/workers.py

@@ -203,6 +203,10 @@ def get_workers(settings):
             tags=['macOS', 'unix', 'arm', 'arm64'],
             parallel_tests=4,
         ),
+        cpw(
+            name="skumaran-ubuntu-x86_64",
+            tags=['linux', 'unix', 'ubuntu', 'amd64', 'x86-64'],
+        ),
         cpw(
             name="ware-alpine",
             tags=['linux', 'unix', 'alpine', 'docker', 'amd64', 'x86-64'],