Test with three different osc versions

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

.gitlab-ci.yml

@@ -30,8 +30,16 @@ test:
   - when: on_success
   needs:
   - build
+  parallel:
+    matrix:
+      - OSC_VERSION:
+        - 0.167.1
+        - 0.182.1
+        - 1.7.0
   script:
   - apt install -y ./_build/*deb dpkg-dev
+  - rm -rf /usr/lib/python3/dist-packages/osc*
+  - pip install "osc==$OSC_VERSION"
   - mkdir -p "$HOME"
   - |
     cat > ~/.oscrc <<EOF