Use OBS built container as CI base to provide all dependencies

Author: okurz

.circleci/config.yml

@@ -3,13 +3,9 @@ version: 2.1
 jobs:
   unit:
     docker:
-      - image: registry.opensuse.org/opensuse/leap:15.3
+      - image: registry.opensuse.org/devel/openqa/ci/containers/openqa-trigger-from-obs-dev
     steps:
       - checkout
-      - run:
-          command: |
-            zypper -n in --no-recommends diffutils make python3 tar python3-black
-      - checkout
       - run: make test_regen_all
       - run: make test_python_style
       - run: make test

container/Dockerfile

@@ -0,0 +1,4 @@
+#!BuildTag: openqa-trigger-from-obs-dev
+#!UseOBSRepositories
+FROM opensuse/leap:15.3
+RUN zypper -n in --no-recommends diffutils tar make python3 python3-black