Include fontconfig in RHEL and Fedora Linux installs (jenkins-infra#6722

)

Install fontconfig on RHEL related distributions

Make the installation instructions more consistent with the packages
that we include in the UBI 8, UBI 9, and AlmaLinux container images.

Make the installation instructions more consistent with the packages
that are tested in the packaging repository.

content/doc/book/installing/linux.adoc

@@ -128,7 +128,7 @@ sudo wget -O /etc/yum.repos.d/jenkins.repo \
 sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io-2023.key
 sudo dnf upgrade
 # Add required dependencies for the jenkins package
-sudo dnf install java-17-openjdk
+sudo dnf install fontconfig java-17-openjdk
 sudo dnf install jenkins
 sudo systemctl daemon-reload
 ----
@@ -145,7 +145,7 @@ sudo wget -O /etc/yum.repos.d/jenkins.repo \
 sudo rpm --import https://pkg.jenkins.io/redhat/jenkins.io-2023.key
 sudo dnf upgrade
 # Add required dependencies for the jenkins package
-sudo dnf install java-17-openjdk
+sudo dnf install fontconfig java-17-openjdk
 sudo dnf install jenkins
 ----
 
@@ -225,7 +225,7 @@ sudo wget -O /etc/yum.repos.d/jenkins.repo \
 sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io-2023.key
 sudo yum upgrade
 # Add required dependencies for the jenkins package
-sudo yum install java-17-openjdk
+sudo yum install fontconfig java-17-openjdk
 sudo yum install jenkins
 sudo systemctl daemon-reload
 ----
@@ -242,7 +242,7 @@ sudo wget -O /etc/yum.repos.d/jenkins.repo \
 sudo rpm --import https://pkg.jenkins.io/redhat/jenkins.io-2023.key
 sudo yum upgrade
 # Add required dependencies for the jenkins package
-sudo yum install java-17-openjdk
+sudo yum install fontconfig java-17-openjdk
 sudo yum install jenkins
 ----