Add plymouth splash to ISO

configs/airootfs/etc/mkinitcpio.conf.d/archiso.conf

@@ -0,0 +1,2 @@
+# Configuration for archiso with Plymouth
+HOOKS=(base udev plymouth modconf archiso archiso_loop_mnt archiso_pxe_common archiso_pxe_nbd archiso_pxe_http archiso_pxe_nfs archiso_kms block filesystems keyboard)

configs/airootfs/etc/plymouth/plymouthd.conf

@@ -0,0 +1,3 @@
+[Daemon]
+Theme=omarchy
+ShowDelay=0

configs/efiboot/loader/entries/01-archiso-x86_64-linux.conf

@@ -0,0 +1,5 @@
+title    Arch Linux install medium (x86_64, UEFI)
+sort-key 01
+linux    /%INSTALL_DIR%/boot/x86_64/vmlinuz-linux
+initrd   /%INSTALL_DIR%/boot/x86_64/initramfs-linux.img
+options  archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID% quiet splash

configs/grub/grub.cfg

@@ -53,7 +53,7 @@ timeout_style=hidden
 
 menuentry "Arch Linux install medium (%ARCH%, ${archiso_platform})" --class arch --class gnu-linux --class gnu --class os --id 'archlinux' {
     set gfxpayload=keep
-    linux /%INSTALL_DIR%/boot/%ARCH%/vmlinuz-linux archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID%
+    linux /%INSTALL_DIR%/boot/%ARCH%/vmlinuz-linux archisobasedir=%INSTALL_DIR% archisosearchuuid=%ARCHISO_UUID% quiet splash
     initrd /%INSTALL_DIR%/boot/%ARCH%/initramfs-linux.img
 }