Add mariner support from SCTK (#1161)

Reference: aboutcode-org/scancode-toolkit#3734
Reference: #1156

Signed-off-by: Ayan Sinha Mahapatra <ayansmahapatra@gmail.com>

Author: AyanSinhaMahapatra

scanpipe/pipes/rootfs.py

@@ -47,6 +47,7 @@
     "fedora",
     "sles",
     "opensuse",
+    "mariner",
     "opensuse-tumbleweed",
     "photon",
     "windows",