add autoremove

Signed-off-by: Nianyu Shen <xiaoyu9964@gmail.com>

Earthfile

@@ -671,7 +671,7 @@ base-image:
             IF [ "$UKI_INSTALL_ALL_FW" = "false" ]
                 RUN modulesextra=$(dpkg-query -W -f='${Package}\n' | grep '^linux-modules-extra-' | head -n 1) && \
                     linuximage=$(dpkg-query -W -f='${Package}\n' | grep '^linux-image-generic-hwe-' | head -n 1) && \
-                    apt-get purge -y --allow-remove-essential linux-firmware wireless-regdb $linuximage $modulesextra
+                    apt-get purge -y --auto-remove --allow-remove-essential linux-firmware wireless-regdb $linuximage $modulesextra
             END
         END
 
@@ -750,6 +750,8 @@ base-image:
             if grep "selinux=1" /etc/cos/bootargs.cfg > /dev/null; then sed -i 's/selinux=1/selinux=0/g' /etc/cos/bootargs.cfg; fi
     END
 
+    SAVE IMAGE palette-base-image:$IMAGE_TAG
+
 # Used to build the installer image.  The installer ISO will be created from this.
 iso-image:
     FROM --platform=linux/${ARCH} +base-image