compose file: enable buildkit for building

thaJeztah · thaJeztah · commit 40b1b403e8ca · 2020-02-24T13:56:16.000+01:00
This adds a `.env` file to enable buildkit when using
docker-compose to build the docs.

Signed-off-by: Sebastiaan van Stijn &lt;github@gone.nl&gt;
diff --git a/.env b/.env
@@ -0,0 +1,2 @@
+COMPOSE_DOCKER_CLI_BUILD=1
+DOCKER_BUILDKIT=1
