apk/openwrt-snapshots.pem contains Elliptic Curve based public key which
is going to be used for signing of apk's package.adb package indexes
after the builds using `apk adbsign --sign-key <key> packages.adb`
command on the buildbot.
References: https://github.com/openwrt/buildbot/pull/46
Link: https://github.com/openwrt/openwrt/pull/16539
Signed-off-by: Petr Štetiar <ynezz@true.cz>
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