Report bug + merge request: image resize is not deterministic.

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+Hi!
+
+While working on Reproducible Builds for Tails, we noticed that
+the img plugin's output is not deterministic: PNG images embed
+timestamps.
+
+The `img-determinism` branch in the
+`https://git-tails.immerda.ch/ikiwiki.git` Git repository has a fix
+for this problem + a new test (that fails without this change, and
+succeeds with the branch merged).
+
+--[[intrigeri]]
+
+[[!tag patch]]