feat(auto update): add script to update github hosted packages

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

scripts/updates/internal/termux_github_auto_update.sh

@@ -0,0 +1,25 @@
+# shellcheck shell=bash
+# Default algorithm to use for packages hosted on github.com
+termux_github_auto_update() {
+	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_tag
+	latest_tag="$(
+		termux_github_api_get_tag "${TERMUX_PKG_SRCURL}" "${TERMUX_PKG_UPDATE_TAG_TYPE}"
+	)"
+
+	if [[ -z "${latest_tag}" ]]; then
+		termux_error_exit "ERROR: Unable to get tag from ${TERMUX_PKG_SRCURL}"
+	fi
+	termux_pkg_upgrade_version "${pkg_epoch}${latest_tag}"
+}