Adds el8 and el9 repos (#7)

Author: StrongestNumber9

_config.yaml

@@ -6,3 +6,9 @@ repos:
   - name: Teragrep Central Releases
     path: central
     description: Contains platform agnostic releases
+  - name: Teragrep EL8 Releases
+    path: linux/el8
+    description: Contains builds that are expected to run on EL8 platform
+  - name: Teragrep EL9 Releases
+    path: linux/el9
+    description: Contains builds that are expected to run on EL9 platform