ARM image for keycloak throws error

[jessesimpson36]

When building your own keycloak docker image on aarch64 architectures (commonly on m1 macs), running recently will throw an error:

ERROR: Failed to run 'build' command.
ERROR: Failed to update server configuration.
ERROR: Could not initialize class sun.util.calendar.ZoneInfoFile
For more details run the same command passing the '--verbose' option. Also you can use '--help' to see the details about the usage of the particular command.

While debugging, I noticed there was a missing symlink, and that the file that the symlink pointed to belongs to a package not installed on our docker image. This PR adds that package, and provides that file.

To debug this, I created an aarch64 VM, since I do not own an M1 Mac, and then I ran

DOCKER_BUILDKIT=0 docker build -t bitnami/keycloak:19.0.3 -f .keycloak/Dockerfile  

And then

docker compose up -d

Before the patch, you will see the error I showed above. After this patch, it should start up normally.

[jessesimpson36]

#243