Shortfix: When updating Dockerfile to use ruby3.0.3-alpine pin alpine to alpine3.13
If you update your Dockerfile to use ruby:3.0.3-alpine and notice the following error while building the image:
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /usr/local/bundle directory.
First know that 3.0.3-alpine actually is using alpine3.14.
The fix is to pin the alpine version to 3.13 so use in your Dockerfile:
FROM ruby:3.0.3-alpine3.13
Why this happens:
Seems like something changed in alpine3.14 and bundle cannot write
in /usr/local/bundle.
Multiple people had this issue:
- Gitlab gitlab.com/gitlab-org/gitlab/-/issues/335641
- Ruby Official Docker Library: github.com/docker-library/ruby/issues/354
It seems to be related to Docker Version running the Dockerfile: