Stable-only: Pin ruby packages in CentOS 8

This change introduces pinning of a few packages to avoid installing
versions incompatible with old Ruby 2.5 in CentOS 8. Note that this
change is submitted to stable/yoga and older stable branches because
CentOS 8 support has been removed during Zed cycle and we no longer
have CentOS 8 integration jobs since then.

Closes-Bug: #1998739
Change-Id: I1b5ebe109b7d0647f324e84b465ed4960f8749f1
(cherry picked from commit 394084fa22)

install_modules.sh

@@ -1,7 +1,8 @@
 #!/bin/bash
 
 set -ex
-
+source /etc/os-release
+export OS_NAME_VERS=${ID}${VERSION_ID}
 GEM_INSTALL_CMD="gem install --no-user-install --minimal-dep --verbose --no-document"
 
 if [ -n "${GEM_HOME}" ]; then
@@ -25,7 +26,17 @@ source $SCRIPT_DIR/functions
 
 print_header 'Start (install_modules.sh)'
 print_header 'Install r10k'
-$GEM_INSTALL_CMD r10k
+
+if [ "${OS_NAME_VERS}" == "centos8" ]; then
+    # faraday-net_http >= 3.0.0 supports only Ruby 2.6.0 but CentOS 8 provides
+    # Ruby 2.5.0
+    $GEM_INSTALL_CMD faraday-net_http -v '< 3.0.0'
+    # Pin a few more packages to avoid updating faraday-net_http
+    $GEM_INSTALL_CMD faraday -v '< 2.0.0'
+    $GEM_INSTALL_CMD r10k -v '< 3.15.0'
+else
+    $GEM_INSTALL_CMD r10k
+fi
 
 # make sure there is no puppet module pre-installed
 rm -rf "${PUPPETFILE_DIR:?}/"*