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buildx correctly complains about our ENV lines: 3 warnings found (use docker --debug to expand): - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 21) - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 94) - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 95) The ENV syntax is defined as ENV FOO=BAR, not ENV FOO BAR, so adjust the Dockerfile to match to get rid of this warning. https://docs.docker.com/reference/dockerfile/#env Signed-off-by: Peter Korsgaard <peter@korsgaard.com>