feat(auto update): add script to update repology tracked packages

Signed-off-by: Aditya Alok <dev.aditya.alok@gmail.com>

scripts/updates/internal/termux_repology_auto_update.sh

@@ -0,0 +1,26 @@
+# shellcheck shell=bash
+termux_repology_auto_update() {
+	# Our local version of package.
+	local pkg_version
+	pkg_version="$(echo "${TERMUX_PKG_VERSION}" | cut -d: -f2-)"
+	local pkg_epoch
+	pkg_epoch="$(echo "${TERMUX_PKG_VERSION}" | cut -d: -f1)"
+
+	if [[ "${pkg_version}" == "${pkg_epoch}" ]]; then
+		# No epoch set.
+		pkg_epoch=""
+	else
+		pkg_epoch+=":"
+	fi
+
+	local latest_version
+	latest_version="$(termux_repology_api_get_latest_version "${TERMUX_PKG_NAME}")"
+
+	# Repology api returns null if package is not tracked by repology or is already upto date.
+	if [[ "${latest_version}" == "null" ]]; then
+		echo "INFO: Already up to date." # Since we exclude unique to termux packages, this package
+		# should be tracked by repology and be already up to date.
+		return 0
+	fi
+	termux_pkg_upgrade_version "${pkg_epoch}${latest_version}"
+}