fix(dev): Use a buildx builder instance we control instead of the default #1534
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We require the "docker-container" driver (via options we pass to
docker buildx build
, e.g. --cache-to) but the default builder instance may use the "docker" driver, leading to errors on dev machines like:Being explicit about our builder avoids that.
This same pattern is used in nextstrain/docker-base's devel/build.¹
¹ nextstrain/docker-base@fac834e5
https://github.com/nextstrain/docker-base/blob/0acdc799/devel/build#L48-L56
Related-to: #1529 (comment)