[calls] ci: Include intltool in Debian image

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit e49614d2038e2e6603c5a4ae7779f8872601e78b
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Wed Aug 17 11:48:45 2022 +0200

    ci: Include intltool in Debian image
    
    We run it and currently also install it in the check-po script.
    Having it preinstalled let's us get rid of the `apt install` stage.
    
    This will help avoiding CI failures like this:
    
    $ apt-get -y install intltool
    Reading package lists...
    Building dependency tree...
    Reading state information...
    Some packages could not be installed. This may mean that you have
    requested an impossible situation or if you are using the unstable
    distribution that some required packages have not yet been created
    or been moved out of Incoming.
    The following information may help to resolve the situation:
    The following packages have unmet dependencies:
     libc6-dev : Breaks: libglib2.0-dev (<= 2.72.3-1) but 2.72.1-1 is to be installed
    
    From https://gitlab.gnome.org/devrtz/calls/-/jobs/2213858#L39

 .gitlab-ci/debian.Dockerfile | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitlab-ci/debian.Dockerfile b/.gitlab-ci/debian.Dockerfile
index c759869a..cda86e88 100644
--- a/.gitlab-ci/debian.Dockerfile
+++ b/.gitlab-ci/debian.Dockerfile
@@ -7,4 +7,5 @@ RUN export DEBIAN_FRONTEND=noninteractive \
    && cd /home/user/app \
    && eatmydata apt-get --no-install-recommends -y build-dep . \
    && eatmydata apt-get --no-install-recommends -y install build-essential git wget gcovr \
+   && eatmydata apt-get --no-install-recommends -y install intltool \
    && eatmydata apt-get clean