download/linux: Bump recommended package to postgresql-18

This bumps the version from 17 to 18 and also splits the final "apt
install" call into a separate box since the heading only claims to
configure the repository.

We also replace "postgresql" by "postgresql-18" since users of our repo
will likely want to have control over which version is selected.

Author: df7cb

media/js/download.js

@@ -27,6 +27,11 @@ function setupHandlers() {
             copyScript(this, 'script-box2');
         });
     }
+    if (document.getElementById("copy-btn3") && document.getElementById("script-box3")) {
+        document.getElementById('copy-btn3').addEventListener('click', function () {
+            copyScript(this, 'script-box3');
+        });
+    }
 }
 
 document.addEventListener("DOMContentLoaded", setupHandlers);

templates/pages/download/linux/debian.html

@@ -77,13 +77,17 @@ <h2>PostgreSQL Apt Repository</h2>
 
 # Update the package lists:
 sudo apt update
-
-# Install the latest version of PostgreSQL:
-# If you want a specific version, use 'postgresql-17' or similar instead of 'postgresql'
-sudo apt -y install postgresql</pre>
     <button id="copy-btn2" class="pg-script-copy-btn">Copy Script</button>
 </div>
 
+Install PostgreSQL: (replace "18" by the version you want)
+
+<div class="pg-script-container">
+    <pre id="script-box3" class="code"># Import the repository signing key:
+sudo apt install postgresql-18</pre>
+    <button id="copy-btn3" class="pg-script-copy-btn">Copy Script</button>
+</div>
+
 <p>
 For more information about the apt repository, including answers to frequent
 questions, please see the
@@ -99,23 +103,23 @@ <h2>Packages</h2>
 <table class="table table-striped">
   <tbody>
     <tr>
-     <th scope="row">postgresql-client-17</th>
+     <th scope="row">postgresql-client-18</th>
      <td>client libraries and client binaries</td>
     </tr>
     <tr>
-     <th scope="row">postgresql-17</th>
+     <th scope="row">postgresql-18</th>
      <td>core database server</td>
     </tr>
     <tr>
-     <th scope="row">postgresql-doc-17</th>
+     <th scope="row">postgresql-doc-18</th>
      <td>documentation</td>
     </tr>
     <tr>
      <th scope="row">libpq-dev</th>
      <td>libraries and headers for C language frontend development</td>
     </tr>
     <tr>
-     <th scope="row">postgresql-server-dev-17</th>
+     <th scope="row">postgresql-server-dev-18</th>
      <td>libraries and headers for C language backend development</td>
     </tr>
   </tbody>

templates/pages/download/linux/ubuntu.html

@@ -76,13 +76,17 @@ <h2>PostgreSQL Apt Repository</h2>
 
 # Update the package lists:
 sudo apt update
-
-# Install the latest version of PostgreSQL:
-# If you want a specific version, use 'postgresql-17' or similar instead of 'postgresql'
-sudo apt -y install postgresql</pre>
     <button id="copy-btn2" class="pg-script-copy-btn">Copy Script</button>
 </div>
 
+Install PostgreSQL: (replace "18" by the version you want)
+
+<div class="pg-script-container">
+    <pre id="script-box3" class="code"># Import the repository signing key:
+sudo apt install postgresql-18</pre>
+    <button id="copy-btn3" class="pg-script-copy-btn">Copy Script</button>
+</div>
+
 <p>
 For more information about the apt repository, including answers to frequent
 questions, please see the
@@ -98,23 +102,23 @@ <h2>Packages</h2>
 <table class="table table-striped">
   <tbody>
     <tr>
-     <th scope="row">postgresql-client-17</th>
+     <th scope="row">postgresql-client-18</th>
      <td>client libraries and client binaries</td>
     </tr>
     <tr>
-     <th scope="row">postgresql-17</th>
+     <th scope="row">postgresql-18</th>
      <td>core database server</td>
     </tr>
     <tr>
-     <th scope="row">postgresql-doc-17</th>
+     <th scope="row">postgresql-doc-18</th>
      <td>documentation</td>
     </tr>
     <tr>
      <th scope="row">libpq-dev</th>
      <td>libraries and headers for C language frontend development</td>
     </tr>
     <tr>
-     <th scope="row">postgresql-server-dev-17</th>
+     <th scope="row">postgresql-server-dev-18</th>
      <td>libraries and headers for C language backend development</td>
     </tr>
   </tbody>