Brennan Kinney 1212ad8e59 refactor: Support syntax without BuildKit features ...

These have been available via opt-in prior to v23 of Docker Engine with `DOCKER_BUILDKIT=1` ENV as a prefix to running `docker build`, however it's been requested to avoid the syntax.

No HereDoc (multi-line RUN with EOF marker) or `RUN --mount` available. This makes the `busybox` approach a hassle, so I've brought back the explicit creation of user and home dir.

Without the cache mounts, bring back `zypper clean`. It's not doing much as the `--cache-dir` is still set, but should reduce disk space for the `builder` layer. Local builds will be slower as a result when this layer is invalidated.

AFAIK, this also makes it tricky to use the `ZYPPER_OPTIONS`? So no longer DRY.

2023-03-22 22:16:28 +13:00

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