add experimental .gitlab-ci.yml

.gitlab-ci.yml

@@ -0,0 +1,17 @@
+# Based on https://pre-commit.com
+#image: python:alpine
+image: pypy:latest
+gitlab-ci-pre-commit:
+  stage: build
+  before_script:
+    #- apk add --no-cache git gcc musl-dev go
+    - pypy3 -m pip install pre-commit
+  script:
+    - pre-commit run --all-files --show-diff-on-failure
+  variables:
+    # Remember to gitignore .cache/**
+    PRE_COMMIT_HOME: ${CI_PROJECT_DIR}/.cache/pre-commit
+    TERM: dumb
+  cache:
+    paths:
+      - ${PRE_COMMIT_HOME}