Jenkins running on blueocean 1.25.0 docker image is not able to read files with non-ASCII characters in the file name. The problem didn't exist in 1.24.7 and only started happening after upgrading the docker image to 1.25.0.

Steps to reproduce:
1. Run container of blueocean docker image 1.24.7
2. Create a job with non-ASCII characters in job name, e.g. my_日本語_build
3. Upgrade docker image to 1.25.0 and run the container of new image
4. Notice the job disappears from both classic and blueocean UIs, though it still exists in $JENKINS_HOME/jobs directory

The reason is most likely because the UTF-8 encoding installation has some problem in 1.25.0 docker image causing the file.encoding and sun.jnu.encoding properties to be set as ANSI_X3.4-1968 instead of UTF-8.

file.encoding property can be overridden using JAVA_OPTS but sun.jnu.encoding is set at runtime based on the system settings and cannot be overridden.

This problem can be solved most likely by setting LANG environment variable to en_US.UTF-8 at the top of the dockerfile. This will allow the following steps involving glibc-i18n and localedef to correctly install UTF-8 encoding in the docker image.