Add support for RHEL 8 (#72)

This PR adds support for RHEL 8, and makes related tweaks.

Author: bthomee

.github/workflows/cleanup.yml

@@ -25,8 +25,9 @@ jobs:
           - debian-bullseye
           - debian-bookworm
           - gcc
-          - rhel-9.4
-          - rhel-9.6
+          - rhel-8
+          - rhel-9
+          - rhel-10
           - tools-rippled-clang-format
           - tools-rippled-documentation
           - tools-rippled-pre-commit

.github/workflows/rhel-ubi.yml

@@ -45,6 +45,9 @@ jobs:
           - platform: linux/arm64
             runner: ubuntu-24.04-arm
         os:
+          - release: 8
+            compiler_name: gcc
+            compiler_version: 14
           - release: 9
             compiler_name: gcc
             compiler_version: 12
@@ -57,6 +60,9 @@ jobs:
           - release: 10
             compiler_name: gcc
             compiler_version: 14
+          - release: 8
+            compiler_name: clang
+            compiler_version: "any"
           - release: 9
             compiler_name: clang
             compiler_version: "any"
@@ -146,6 +152,9 @@ jobs:
     strategy:
       matrix:
         os:
+          - release: 8
+            compiler_name: gcc
+            compiler_version: 14
           - release: 9
             compiler_name: gcc
             compiler_version: 12
@@ -158,6 +167,9 @@ jobs:
           - release: 10
             compiler_name: gcc
             compiler_version: 14
+          - release: 8
+            compiler_name: clang
+            compiler_version: "any"
           - release: 9
             compiler_name: clang
             compiler_version: "any"