Create infra directory

infra/.gitignore

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+# macOS
+.DS_Store

infra/README.md

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+# Infra
+
+Various knick-knacks that we use when hosting our servers.
+
+These are not needed for running Ente's server or for self-hosting, these are
+just additional services we run to make our infrastructure more robust. As such,
+it's unlikely that you'll find the pieces here directly useful for your needs,
+but feel free to have a look around if you're curious!