add: dracut-strip-trigger (#5287) (#5304)

(cherry picked from commit 09d12f9319)

Co-authored-by: madomado <madonuko@outlook.com>

anda/system/dracut-strip-trigger/LICENSE

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+../../../LICENSE

anda/system/dracut-strip-trigger/anda.hcl

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+project pkg {
+	rpm {
+		spec = "dracut-strip-trigger.spec"
+	}
+}

anda/system/dracut-strip-trigger/dracut-strip-trigger.spec

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+Name:		dracut-strip-trigger
+Version:	0
+Release:	1%?dist
+Summary:	Strip initramfs aggressively
+License:	GPL-3.0-only
+Requires(post): dracut
+Source0:	LICENSE
+
+%global _desc %{expand:
+Strip initramfs automatically for each kernel update using --hostonly --aggressive-strip.
+Do not install this package if you plan to use the system on different devices (e.g.
+raw images like Raspberry Pi images).}
+
+%description %_desc
+
+%prep
+cat<<EOF > README
+%name %_desc
+EOF
+cp %{S:0} .
+
+%files
+%doc README
+%license LICENSE
+
+%post
+echo 'Regenerating all initramfs…'
+dracut --force --parallel --regenerate-all --hostonly --strip --aggressive-strip
+echo 'All non-rescue initramfs have been regenerated.'
+echo 'If you have problems booting up, use the rescue image, then uninstall `%name`.'
+
+%triggerin -- kernel
+dracut --force --hostonly --strip --aggressive-strip
+
+%postun
+echo 'Regenerating all initramfs…'
+[ $1 = 0 ] && dracut --force --parallel --regenerate-all --no-hostonly --strip