Merge pull request #136 from mautrix/ci-update-container-versions-on-success

ci: only update container versions on success

.gitlab-ci.yml

@@ -19,7 +19,7 @@ build amd64:
   - docker rmi $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA-amd64
   after_script:
   - |
-    if [[ "$CI_COMMIT_BRANCH" == "master" ]]; then
+    if [[ "$CI_COMMIT_BRANCH" == "master" && "$CI_JOB_STATUS" == "success" ]]; then
       apk add --update curl jq
       rm -rf /var/cache/apk/*