Update keyring location (#521)

Author: basil

templates/header.debian.html

@@ -9,15 +9,15 @@
 
   <pre class="text-white bg-dark">
     <code>
-  sudo wget -O /usr/share/keyrings/jenkins-keyring.asc \
+  sudo wget -O /etc/apt/keyrings/jenkins-keyring.asc \
     <a href="{{web_url}}/{{organization}}-2023.key" style="color:white">{{web_url}}/{{organization}}-2023.key</a></code>
   </pre>
 
   Then add a Jenkins apt repository entry:
 
   <pre class="text-white bg-dark">
     <code>
-  echo "deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc]" \
+  echo "deb [signed-by=/etc/apt/keyrings/jenkins-keyring.asc]" \
     {{ web_url }} binary/ | sudo tee \
     /etc/apt/sources.list.d/jenkins.list > /dev/null</code>
   </pre>