add apk-upgrade(8)

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+apk-upgrade(8)
+
+# NAME
+
+apk upgrade - upgrade installed packages
+
+# SYNOPSIS
+
+*apk upgrade* [<_options_>...]
+
+# DESCRIPTION
+
+*apk upgrade* upgrades installed packages to the latest version available from
+configured package repositories (see *apk-repositories*(5)).
+
+# OPTIONS
+
+## COMMIT OPTIONS
+
+*apk upgrade* commits the database, and supports the same options as other
+commit operations.
+
+*-s, --simulate*
+	Simulate the requested operation without making any changes.
+
+*--clean-protected*
+	Do not create .apk-new files in configuration directories.
+
+*--overlay-from-stdin*
+	Read list of overlay files from stdin.
+
+*--no-scripts*
+	Do not execute any scripts.
+
+*--no-commit-hooks*
+	Skip pre/post hook scripts (but not other scripts).
+
+*--initramfs-diskless-boot*
+	Enables options for diskless initramfs boot (e.g. skip hooks).
+
+## UPGRADE OPTIONS
+
+The following options affect the *upgrade* operation.
+
+*-a, --available*
+	Resets version constraints in _world_ (see *apk-world*(5)) and prefers
+	replacing or downgrading packages if the currently installed package is
+	no longer available from any repository (instead of holding them).
+
+*-l, --latest*
+	Disables normal heuristics for choosing which repository to install a
+	package from, preferring only repositories from which the latest
+	version is available. This has no effect on pinned packages.
+
+*--no-self-upgrade*
+	Do not do an early upgrade of the 'apk-tools' package.
+
+*--self-upgrade-only*
+	Only perform a self-upgrade of the 'apk-tools' package.
+
+# AUTHORS
+
+Natanael Copa <ncopa@alpinelinux.org>++
+Timo Teräs <_timo.teras@iki.fi_>