Use equals sign (=) instead of space as ENV variable separator #753
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I got the following error in my CI:
![image](https://private-user-images.githubusercontent.com/5700014/384891678-e232a195-f660-4669-b89d-f2bc7b7156c7.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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._DGT4oc3-tZljJ79HTsZn94qCzcTogFr7Utu40rxKoo)
LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format
See https://docs.docker.com/reference/build-checks/legacy-key-value-format/
This PR makes sure all ENV variable definitions use the "correct"
ENV key=value
syntax