build: image: use UTC for zip timestamp
Zip uses DOS timestamp for mtime which is stored in local time and hence
depends on the timezone of the build system. Force zip to use UTC timezone
to make image builds more reproducible.
Signed-off-by: Sungbo Eo <mans0n@gorani.run>
(cherry picked from commit e42764cc5f)
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@ -183,7 +183,7 @@ define Build/zip
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mkdir $@.tmp
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mv $@ $@.tmp/$(1)
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zip -j -X \
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TZ=UTC zip -j -X \
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$@ $@.tmp/$(if $(1),$(1),$@)
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rm -rf $@.tmp
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endef
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