ci: add arm support

Author: Suyun114

.github/workflows/nightly-release.yaml

@@ -48,7 +48,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os:       [ubuntu-22.04, ubuntu-24.04]
+        os:       [ubuntu-22.04, ubuntu-24.04, ubuntu-22.04-arm, ubuntu-24.04-arm]
         mode:     [newlib, linux, musl, uclibc]
         target:   [rv32gc-ilp32d, rv64gc-lp64d]
         compiler: [gcc, llvm]