Revert "Disable Docker Buildkit by default."

This reverts commit 393f2782.

.bashrc

@@ -51,6 +51,8 @@ export LESS_TERMCAP_se=$'\E[0m'
 export LESS_TERMCAP_us=$'\E[01;32m'
 export LESS_TERMCAP_ue=$'\E[0m'
 export HELM_HOME="$HOME/.helm"
+export DOCKER_BUILDKIT=1
+export COMPOSE_DOCKER_CLI_BUILD=1
 
 alias ll='ls -lha'
 alias la='ls -AF'