[gimp-help/wip/wormnest/validate] ci: add pip install polib needed by validate_po.py

[Jacob Boerema <jboerema src gnome org>]

commit 417ab3153f90c5ef003816ae8bceeb1fcf62e6b7
Author: Jacob Boerema <jgboerema gmail com>
Date:   Sat Jul 23 13:34:22 2022 -0400

    ci: add pip install polib needed by validate_po.py

 .gitlab-ci.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f7cf7b378..ca4e10aa8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -25,7 +25,7 @@ build-image:
     - echo "FROM debian:testing" > Dockerfile
     - echo "RUN apt-get update" >> Dockerfile
     - echo "RUN apt-get install -y --no-install-recommends \\" >> Dockerfile
-    - echo "automake build-essential docbook-website docbook-xml docbook-xsl fonts-noto-cjk gettext intltool 
librsvg2-2 librsvg2-bin pkg-config pngcrush python3 python3-libxml2 xsltproc" >> Dockerfile
+    - echo "automake build-essential docbook-website docbook-xml docbook-xsl fonts-noto-cjk gettext intltool 
librsvg2-2 librsvg2-bin pkg-config pngcrush python3 python3-libxml2 python3-pip xsltproc" >> Dockerfile
 
     - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination 
$CI_REGISTRY_IMAGE:build-debian-latest --cache=true --cache-ttl=120h
 
@@ -33,6 +33,7 @@ po-validate:
   stage: validatepo
   image: $CI_REGISTRY_IMAGE:build-debian-latest
   script:
+    - pip install polib
     - cd po
     - find . -type f -print0 | xargs -0 ../tools/validate_po.py $1 $2
   needs: ["build-image"]