init: Start dotfiles with a test container to verify installation.

.profile

@@ -0,0 +1,24 @@
+#!/usr/bin/env sh
+# PS1='[\u@\h \W]\$ '
+
+export XDG_CONFIG_HOME="$HOME/.config"
+export XDG_DATA_HOME="$HOME/.local/share"
+export XDG_CACHE_HOME="$HOME/.cache"
+
+export INPUTRC="${XDG_CONFIG_HOME:-$HOME/.config}/inputrc"
+export ALIASRC="${XDG_CONFIG_HOME:-$HOME/.config}/aliasrc"
+
+if docker --version > /dev/null 2>&1; then
+    PS1="\[\033[38;5;34m\]\u@\h \W]\\$\[$(tput sgr0)\] "
+    export PS1
+else
+    PS1="\[\033[38;5;44m\]\u@\h \W]\\$\[$(tput sgr0)\] "
+    export PS1
+fi
+
+# Git should ask for a password through the command line.
+unset GIT_ASKPASS
+unset SSH_ASKPASS
+
+# shellcheck source=./.config/aliasrc
+[ -f "$ALIASRC" ] && . ./"$ALIASRC"