Previous fix (--exclude=*.so) only affects the strip phase. dh_strip
also runs a separate --only-keep-debug pass for the automatic dbgsym
package, and that pass does not honour --exclude. So objcopy still
trips on the ARM64 .so files and the build aborts.
Add --no-automatic-dbgsym to skip the dbgsym pass entirely. Trade-
off: no separate postit-dbg package is generated. That's fine for
this upstream — the only debug info in the .so files is from Avalonia
deps (HarfBuzz, Skia) and is not useful for debugging PostIt itself.
Discovered via the Forgejo Actions run #8 on tag 1.0.6.