gitlab-ci: add libatomic to docker images

Add libatomic to the Fedora docker image so it can link binaries that
use __atomic_* functions.  Also explicitly add libatomic1 to Debian
docker images as it is needed in particular on non-x86 architectures
for run-time linkage.

Signed-off-by: Guillaume Tucker <guillaume.tucker@collabora.com>
Reviewed-by: Simon Ser <simon.ser@intel.com>
diff --git a/Dockerfile.fedora b/Dockerfile.fedora
index 6686e58..c84b412 100644
--- a/Dockerfile.fedora
+++ b/Dockerfile.fedora
@@ -1,7 +1,7 @@
 FROM fedora:30
 
 RUN dnf install -y \
-	gcc flex bison meson ninja-build xdotool \
+	gcc flex bison libatomic meson ninja-build xdotool \
 	'pkgconfig(libdrm)' \
 	'pkgconfig(pciaccess)' \
 	'pkgconfig(libkmod)' \