Add missing archs to allowed_archs_as_regex_str

The `chroot_pattern` in `config.py` couldn't be filtered to remove
`riscv64` and `x86_64_v2` chroots before this patch because
it thought that those were unknown architectures.

Author: kwk

snapshot_manager/snapshot_manager/util.py

@@ -272,7 +272,7 @@ def allowed_archs_as_regex_str() -> str:
     Example:
 
     >>> allowed_archs_as_regex_str()
-    '(aarch64|i386|ppc64le|s390x|x86_64)'
+    '(aarch64|i386|ppc64le|s390x|x86_64|riscv64|x86_64_v2)'
     """
     return "(" + "|".join(allowed_archs()) + ")"
 
@@ -305,6 +305,12 @@ def expect_chroot(chroot: str) -> str:
     >>> expect_chroot("centos-stream-10-x86_64")
     'centos-stream-10-x86_64'
 
+    >>> expect_chroot("fedora-42-riscv64")
+    'fedora-42-riscv64'
+
+    >>> expect_chroot("centos-stream-10-x86_64_v2")
+    'centos-stream-10-x86_64_v2'
+
     >>> expect_chroot("fedora-rawhide-")
     Traceback (most recent call last):
       ...
@@ -466,6 +472,12 @@ def chroot_arch(chroot: str) -> str:
     >>> chroot_arch(chroot="fedora-40-ppc64le")
     'ppc64le'
 
+    >>> chroot_arch(chroot="fedora-42-riscv64")
+    'riscv64'
+
+    >>> chroot_arch(chroot="fedora-42-x86_64_v2")
+    'x86_64_v2'
+
     >>> chroot_arch(chroot="fedora-rawhide-NEWARCH")
     Traceback (most recent call last):
       ...