we actually need certs otherwise fetch fails

.gitlab-ci.yml

@@ -20,7 +20,7 @@ find-files-commit:
   stage: build
   image: debian:stable-slim
   script:
-    - apt update && apt install -yy --no-install-recommends git
+    - apt update && apt install -yy --no-install-recommends git ca-certificates
     - echo "commit SHA $CI_COMMIT_SHA"
     - |
       echo "working on files... $(git diff-tree --no-commit-id --name-only -r $CI_COMMIT_SHA | tee changed-files.txt)"