ci: Force fallback for glib when building gstreamer

Also canonicalize some argument passing in install-gst.sh

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1506>

.gitlab-ci.yml

@@ -143,8 +143,9 @@ trigger:
       libtiff-dev libpng-dev libjpeg-dev libepoxy-dev libsass-dev sassc
       libcsound64-dev llvm clang nasm libsodium-dev libwebp-dev
       libflac-dev libmysofa-dev
+    # glib in bookworm is too old, need 2.76 for gtk-4.14
     FDO_DISTRIBUTION_EXEC: >-
-      bash ci/install-gst.sh &&
+      bash ci/install-gst.sh --force-fallback-for=glib &&
       bash ci/install-dav1d.sh &&
       pip3 install --break-system-packages git+http://gitlab.freedesktop.org/freedesktop/ci-templates &&
       pip3 install --break-system-packages tomli

ci/images_template.yml

@@ -1,5 +1,5 @@
 variables:
-  GST_RS_IMG_TAG: "2024-08-19.0"
+  GST_RS_IMG_TAG: "2024-08-19.1"
   GST_RS_STABLE: "1.80.1"
   GST_RS_MSRV: "1.71.1"
   # The branch we use to build GStreamer from in the docker images

ci/install-gst.sh

@@ -16,13 +16,15 @@ git clone https://gitlab.freedesktop.org/gstreamer/gstreamer.git \
 cd gstreamer
 
 # plugins required by tests
-PLUGINS="-D gst-plugins-base:ogg=enabled \
+PLUGINS=(
-         -D gst-plugins-base:vorbis=enabled \
+    -Dgst-plugins-base:ogg=enabled
-         -D gst-plugins-base:theora=enabled \
+    -Dgst-plugins-base:vorbis=enabled
-         -D gst-plugins-good:matroska=enabled \
+    -Dgst-plugins-base:theora=enabled
-         -D gst-plugins-good:vpx=enabled \
+    -Dgst-plugins-good:matroska=enabled
-         -D gst-plugins-bad:opus=enabled \
+    -Dgst-plugins-good:vpx=enabled
-         -D gst-plugins-ugly:x264=enabled"
+    -Dgst-plugins-bad:opus=enabled
+    -Dgst-plugins-ugly:x264=enabled
+)
 
 meson setup build \
     -Dprefix=/usr/local \
@@ -35,7 +37,7 @@ meson setup build \
     -Dlibav=disabled \
     -Dpython=disabled \
     -Dvaapi=disabled \
-    $PLUGINS
+    "${PLUGINS[@]}" "$@"
 meson compile -C build
 meson install -C build
 ldconfig