run.dlang.io: dmd-nightly not using nightly build

[Dennis]

Evidenced by selecting dmd-nightly and running this:

pragma(msg, __VERSION__);

Which prints 2098L, while dmd-beta prints 2099L

[Florian]

It's using the nightly build but the newer images hang when compiling D code (for some unknown reason). That causes run.dlang.io to retain the latest working image.

[Petar Kirov]

The nightly should be fixed now. The problem was that the server ran out of the disk space. I deleted the old images and now it's up to date:

REPOSITORY                         TAG                 IMAGE ID            CREATED             SIZE
docker.io/dlangtour/core-exec      ldc                 0e3a757aae9b        9 hours ago         2.08 GB
docker.io/dlangtour/core-exec      dmd-nightly         65ceaf460b65        9 hours ago         2.18 GB
docker.io/dlangtour/core-exec      dmd                 97e9ddc8785a        9 hours ago         2.17 GB
docker.io/dlangtour/core-exec      dmd-beta            484a64a819a6        9 hours ago         2.17 GB
docker.io/dlangtour/core-exec      ldc-beta            04c8ba73dbd9        2 weeks ago         2.08 GB

I opened a PR with various CI/CD implements: #772