Dockerfile: switch to "stable" dockerfile front-end

The `RUN --mount` options have been promoted to the stable channel,
so we can switch from "experimental" to "stable".

Note that the syntax directive should no longer be needed now, but
it's good practice to add a syntax-directive, to allow building on
older versions of docker.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2020-12-14 12:06:37 +01:00
parent 4a054ec00f
commit 083dbe9fcd
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@ -1,4 +1,4 @@
# syntax=docker/dockerfile:1.1.7-experimental
# syntax=docker/dockerfile:1.2
ARG CROSS="false"
ARG SYSTEMD="false"