[librsvg/meson-2022-oct] CI: install meson

[Federico Mena Quintero <federico src gnome org>]

commit a6dc1a044988dac7d1e7df02e2e743e0d3ca6a0c
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed Oct 12 10:57:37 2022 -0500

    CI: install meson

 ci/container_builds.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/ci/container_builds.yml b/ci/container_builds.yml
index 9ddcf6922..7f1f5f456 100644
--- a/ci/container_builds.yml
+++ b/ci/container_builds.yml
@@ -6,7 +6,7 @@ include:
 variables:
   # When branching change the suffix to avoid conflicts with images
   # from the main branch
-  BASE_TAG: "2022-09-26.4-main"
+  BASE_TAG: "2022-10-12.0-meson-2022-oct"
   RUST_STABLE: "1.64.0"
   RUST_MINIMUM: "1.58.1"
 
@@ -36,6 +36,7 @@ variables:
       libtool
       libxml2-devel
       make
+      meson
       openssl-devel
       pango-devel
       python3-pip