Dockerfiles: correct ENV format
Avoid docker warning: - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format
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@@ -57,7 +57,7 @@ RUN apt-get update && \
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# Add "Tini - A tiny but valid init for containers", https://github.com/krallin/tini
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# it will be copied into target containers, to print exit numbers and handle signals properly
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ENV TINI_VERSION v0.19.0
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ENV TINI_VERSION=v0.19.0
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ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
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RUN chmod +x /tini
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