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Dockerfile: optimize layers #10103

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@@ -177,8 +177,7 @@ RUN find /dpkg/ -type d -empty -delete && \
# We want latest at time of build
# hadolint ignore=DL3006
FROM gcr.io/distroless/cc-debian12 AS production
ARG RELEASE_VERSION
ENV FLUENT_BIT_VERSION=${RELEASE_VERSION}
EXPOSE 2020
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Moved up, as this is not likely to change, meaning the layer doesn't have to be rebuild,pushed,pulled.

@marcofranssen
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Rebased on top of master branch and fixed following small mistake.

UndefinedVar: Usage of undefined variable '$RELEASE_VERSION'
More info: https://docs.docker.com/go/dockerfile/rule/undefined-var/

Squashed some layers to reduce the amount of layers in the image. Also rearranged some layers to reduce the amount of layers that have to be rebuild.

If one layer changes all layers after have to be updated. By moving the ones least likely to change first this means less layers have to be rebuild, pushed and pulled on new releases.

Signed-off-by: Marco Franssen <[email protected]>
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