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myasnikovdaniil
6329ffecfc
## What this PR does The `Build cache (main)` workflow (`build-main.yaml`, added in #2948) failed on its first run: https://github.com/cozystack/cozystack/actions/runs/27929277423 The `Set up Buildx` step ran without `DOCKER_CONFIG`, so `docker/setup-buildx-action` created the docker-container builder under the runner's default `~/.docker`. The build step runs with `DOCKER_CONFIG=$RUNNER_TEMP/.docker` (seeded earlier, holding the OCIR auth), so buildx couldn't find the builder and failed immediately: ``` ERROR: no builder "builder-6fb46242-…" found ``` The post-job `docker buildx rm` still succeeded — because the action's cleanup runs under the default config where the builder actually lived — which confirms the builder existed but in the wrong config store. This sets `DOCKER_CONFIG` on the `Set up Buildx` step so the builder instance is created in the same config the build step reads. Impact: only the main cache-warmer was broken. PR builds `--cache-from` this ref, so a missing cache is a cold build, not a failure — but the warm-cache speedup from #2948 wasn't being delivered until this fix. ### Release note ```release-note NONE ``` <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Chores** * Improved build pipeline stability by ensuring consistent Docker configuration across workflow steps. This enhances the reliability of the container build and deployment process. <!-- end of auto-generated comment: release notes by coderabbit.ai -->