"ENV key=value" should be used instead of legacy "ENV key value" format #857
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The correct format for declaring environment variables and build arguments in a Dockerfile is ENV key=value and ARG key=value, where the variable name (key) and value (value) are separated by an equals sign (=). Historically, Dockerfiles have also supported a space separator between the key and the value (for example, ARG key value). This legacy format is deprecated, and you should only use the format with the equals sign.
https://docs.docker.com/reference/build-checks/legacy-key-value-format/