Add package repository install instructions page

Add /download/packages/ page with interactive install instructions
for RPM, DEB, and SUSE-based Linux distributions. Includes version
and OS dropdowns, step-by-step commands, and copy-to-clipboard
functionality. Add Packages link under Download nav submenu.

Signed-off-by: Evgeniy Patlan <evgeniy.patlan@percona.com>

Author: EvgeniyPatlan

content/download/packages/index.md

@@ -0,0 +1,71 @@
++++
+template = "packages.html"
+title = "Package Repository"
+description = "Install Valkey on Linux using official RPM and DEB packages"
+
+[extra]
+repo_url = "https://download.valkey.io/packaging"
+gpg_key_url = "https://download.valkey.io/packaging/GPG-KEY-valkey.asc"
+
+versions = ["9.0", "8.1", "8.0"]
+
+[[extra.os_groups]]
+label = "RHEL / Oracle Linux"
+entries = [
+  { value = "el8", name = "Oracle Linux 8 / RHEL 8", type = "rpm", pkg = "dnf" },
+  { value = "el9", name = "Oracle Linux 9 / RHEL 9", type = "rpm", pkg = "dnf" },
+  { value = "el10", name = "Oracle Linux 10 / RHEL 10", type = "rpm", pkg = "dnf" },
+]
+
+[[extra.os_groups]]
+label = "Rocky Linux"
+entries = [
+  { value = "rocky8", name = "Rocky Linux 8", type = "rpm", pkg = "dnf" },
+  { value = "rocky9", name = "Rocky Linux 9", type = "rpm", pkg = "dnf" },
+  { value = "rocky10", name = "Rocky Linux 10", type = "rpm", pkg = "dnf" },
+]
+
+[[extra.os_groups]]
+label = "AlmaLinux"
+entries = [
+  { value = "alma8", name = "AlmaLinux 8", type = "rpm", pkg = "dnf" },
+  { value = "alma9", name = "AlmaLinux 9", type = "rpm", pkg = "dnf" },
+  { value = "alma10", name = "AlmaLinux 10", type = "rpm", pkg = "dnf" },
+]
+
+[[extra.os_groups]]
+label = "Amazon Linux"
+entries = [
+  { value = "amzn2023", name = "Amazon Linux 2023", type = "rpm", pkg = "dnf" },
+]
+
+[[extra.os_groups]]
+label = "Fedora"
+entries = [
+  { value = "fedora39", name = "Fedora 39", type = "rpm", pkg = "dnf" },
+  { value = "fedora40", name = "Fedora 40", type = "rpm", pkg = "dnf" },
+  { value = "fedora41", name = "Fedora 41", type = "rpm", pkg = "dnf" },
+]
+
+[[extra.os_groups]]
+label = "openSUSE"
+entries = [
+  { value = "opensuse-15.5", name = "openSUSE Leap 15.5", type = "suse", pkg = "zypper" },
+  { value = "opensuse-15.6", name = "openSUSE Leap 15.6", type = "suse", pkg = "zypper" },
+]
+
+[[extra.os_groups]]
+label = "Debian"
+entries = [
+  { value = "debian11", name = "Debian 11 (Bullseye)", type = "deb", pkg = "" },
+  { value = "debian12", name = "Debian 12 (Bookworm)", type = "deb", pkg = "" },
+  { value = "debian13", name = "Debian 13 (Trixie)", type = "deb", pkg = "" },
+]
+
+[[extra.os_groups]]
+label = "Ubuntu"
+entries = [
+  { value = "ubuntu2204", name = "Ubuntu 22.04 (Jammy)", type = "deb", pkg = "" },
+  { value = "ubuntu2404", name = "Ubuntu 24.04 (Noble)", type = "deb", pkg = "" },
+]
++++

templates/default.html

@@ -43,7 +43,12 @@
         onclick="window.toggleHeaderMenu();"
       ></div>
       <nav role="navigation" aria-label="Main">
-        <a role="menuitem" href="/download/">Download</a>
+        <div class="has-submenu">
+          <a role="menuitem" href="/download/">Download</a>
+          <div class="submenu">
+            <a role="menuitem" href="/download/packages/">Packages</a>
+          </div>
+        </div>
 
         <div class="has-submenu">
           <a role="menuitem" href="/docs/">Documentation</a>