add deb822 apt sources to install section in Debian

Author: LLdaniel

content/manuals/engine/install/debian.md

@@ -114,11 +114,21 @@ Docker from the repository.
    sudo curl -fsSL {{% param "download-url-base" %}}/gpg -o /etc/apt/keyrings/docker.asc
    sudo chmod a+r /etc/apt/keyrings/docker.asc
 
-   # Add the repository to Apt sources:
+   # Add the repository to Apt sources (legacy format):
    echo \
      "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] {{% param "download-url-base" %}} \
      $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
      sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+
+   # Add the repository to Apt sources (new deb822 format, introduced with Trixie):
+   echo -e \
+     "Types: deb\n \
+	 URIs: https://download.docker.com/linux/debian/\n \
+	 Suites: $(. /etc/os-release && echo "$VERSION_CODENAME")\n \
+	 Components: stable\n \
+	 Signed-By: /etc/apt/keyrings/docker.gpg" | \
+	 sudo tee /etc/apt/sources.list.d/docker.sources > /dev/null
+
    sudo apt-get update
    ```