dependencyinstaller: do not reinstall docker if it is installed

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

etc/DependencyInstaller.sh

@@ -160,6 +160,14 @@ _installUbuntuPackages() {
         rm -rf "${baseDir}"
     fi
 
+    if command -v docker &> /dev/null; then
+        # The user can uninstall docker if they want to reinstall it,
+        # and also this allows the user to choose drop in replacements
+        # for docker, such as podman-docker
+        echo "Docker is already installed, skip docker reinstall."
+        return 0
+    fi
+
     # Add Docker's official GPG key:
     install -m 0755 -d /etc/apt/keyrings
     curl -fsSL https://download.docker.com/linux/ubuntu/gpg \