fix(ci): disable QEMU test for dynamically linked aarch64-gnu

The aarch64-unknown-linux-gnu binary is dynamically linked to glibc
and requires aarch64 libraries that aren't available on x86_64 runners.

Keep QEMU testing only for aarch64-unknown-linux-musl which is
statically linked and works correctly under QEMU user-mode emulation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: bordeux

.github/workflows/_build-binaries.yml

@@ -44,15 +44,14 @@ jobs:
             os: ubuntu-22.04
             artifact_name: tmpltool
             asset_name: tmpltool-linux-aarch64
-            can_test: true
-            use_qemu: true  # Test via QEMU user-mode emulation
+            can_test: false  # Dynamically linked, needs aarch64 glibc libs
 
           - target: aarch64-unknown-linux-musl
             os: ubuntu-latest
             artifact_name: tmpltool
             asset_name: tmpltool-linux-aarch64-musl
             can_test: true
-            use_qemu: true  # Test via QEMU user-mode emulation
+            use_qemu: true  # Statically linked, works with QEMU
 
           - target: x86_64-apple-darwin
             os: macos-latest