[gtk] CI: install meson 0.50

[Christoph Reiter <creiter src gnome org>]

commit 80c26ab9045030b51e00117dccbbd85313e2cf7a
Author: Christoph Reiter <creiter src gnome org>
Date:   Thu Mar 28 22:47:18 2019 +0100

    CI: install meson 0.50

 .gitlab-ci.yml           | 4 ++--
 .gitlab-ci/Dockerfile    | 2 +-
 .gitlab-ci/run-docker.sh | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b60004ae1e..620cba17f4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -13,7 +13,7 @@ stages:
     - subprojects/pango/
 
 fedora-x86_64:
-  image: registry.gitlab.gnome.org/gnome/gtk/master:v2
+  image: registry.gitlab.gnome.org/gnome/gtk/master:v3
   stage: build
   script:
     - bash -x ./.gitlab-ci/test-docker.sh
@@ -64,7 +64,7 @@ flatpak:widget-factory:
   <<: *flatpak-defaults
 
 pages:
-  image: registry.gitlab.gnome.org/gnome/gtk/master:v2
+  image: registry.gitlab.gnome.org/gnome/gtk/master:v3
   stage: deploy 
   script:
     - meson -Ddocumentation=true _build .
diff --git a/.gitlab-ci/Dockerfile b/.gitlab-ci/Dockerfile
index 051bd9da4c..a2866c5fac 100644
--- a/.gitlab-ci/Dockerfile
+++ b/.gitlab-ci/Dockerfile
@@ -70,7 +70,7 @@ RUN dnf -y install \
     xorg-x11-server-Xvfb \
  && dnf clean all
 
-RUN pip3 install meson==0.49.0
+RUN pip3 install meson==0.50.0
 
 ARG HOST_USER_ID=5555
 ENV HOST_USER_ID ${HOST_USER_ID}
diff --git a/.gitlab-ci/run-docker.sh b/.gitlab-ci/run-docker.sh
index 1fba076bd9..4b103b09a7 100755
--- a/.gitlab-ci/run-docker.sh
+++ b/.gitlab-ci/run-docker.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-TAG="registry.gitlab.gnome.org/gnome/gtk/master:v2"
+TAG="registry.gitlab.gnome.org/gnome/gtk/master:v3"
 
 sudo docker build --build-arg HOST_USER_ID="$UID" --tag "${TAG}" \
     --file "Dockerfile" .