rootfs: Add common overlay

Start out with some convenience macros and a proper PS1.

board/common/rootfs/etc/profile.d/convenience.sh

@@ -0,0 +1,18 @@
+alias l='ls -CF'
+alias la='ls -A'
+alias ll='ls -alF'
+alias ls='ls --color=auto'
+
+alias vim='vi'
+alias view='vi -R'
+alias emacs='mg'
+alias edit='mg'
+alias editor=edit
+alias sensible-editor=edit
+alias sensible-pager=less
+export EDITOR=/usr/bin/mg
+
+alias ip='ip --color=auto'
+alias ipb='ip -br'
+alias bridge='bridge --color=auto'
+

board/common/rootfs/etc/profile.d/ps1.sh

@@ -0,0 +1 @@
+PS1='\u@\h:\w\$ '

configs/aarch64_defconfig

@@ -12,6 +12,7 @@ BR2_GLOBAL_PATCH_DIR="$(BR2_EXTERNAL_INFIX_PATH)/patches"
 BR2_TARGET_GENERIC_HOSTNAME="infix"
 BR2_TARGET_GENERIC_ISSUE="Inf/IX by KernelKit"
 BR2_INIT_FINIT=y
+BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_INFIX_PATH)/board/common/rootfs"
 BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_INFIX_PATH)/board/common/post-build.sh"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y