ci: cleanup build job, follow old release naming

misc/repack.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+# see .gitea/workflows/build.yml
+
+APP_VERSION="${1:-$(git describe --tags --always)}"
+
+for exe in prepare/*/um-*.exe; do
+    name="$(basename "$exe" .exe)-$APP_VERSION"
+    new_exe="$(dirname "$exe")/um.exe"
+    mv "$exe" "$new_exe"
+
+    zip -9 -j "dist/${name}.zip" "$new_exe"
+    rm -f "$new_exe"
+done
+
+for exe in prepare/*/um-*; do
+    name="$(basename "$exe")-$APP_VERSION"
+    new_exe="$(dirname "$exe")/um"
+    mv "$exe" "$new_exe"
+
+    tar \
+        --sort=name --format=posix \
+        --pax-option=exthdr.name=%d/PaxHeaders/%f \
+        --pax-option=delete=atime,delete=ctime \
+        --clamp-mtime --mtime='1970-01-01T00:00:00Z' \
+        --numeric-owner --owner=0 --group=0 \
+        --mode=0755 \
+        -cv -C "$(dirname "$exe")" um |
+        gzip -9 >"dist/${name}.tar.gz"
+    rm -f "$exe"
+done
+
+pushd dist
+sha256sum *.zip *.tar.gz >sha256sum.txt
+popd