ci: install pkgs in gcc-loongarch64-linux-gnu by manual

Author: inkydragon

.github/workflows/cross.yml

@@ -37,10 +37,18 @@ jobs:
       TRIPLE: ${{ matrix.config.triple }}
     steps:
       - uses: actions/checkout@v4
-      - name: Install qemu and toolchain gcc-${{ matrix.config.triple }}
+      - name: Install qemu
         run: |
           sudo apt update
-          sudo apt install qemu-user qemu-user-binfmt gcc-$TRIPLE -y
+          sudo apt install -y qemu-user qemu-user-binfmt
+      - name: Install gcc-${{ matrix.config.triple }}
+        if: ${{ 'loongarch64' != matrix.config.arch }}
+        run: sudo apt install -y gcc-$TRIPLE
+      - name: Install gcc-${{ matrix.config.triple }}
+        if: ${{ 'loongarch64' == matrix.config.arch }}
+        # package gcc-loongarch64-linux-gnu seems not exist
+        # https://packages.debian.org/sid/amd64/gcc-loongarch64-linux-gnu
+        run: sudo apt install -y gcc-14-loongarch64-linux-gnu cpp-loongarch64-linux-gnu
       - name: Build with ${{ matrix.config.triple }}-gcc
         run: make ARCH=$ARCH TOOLPREFIX=$TRIPLE-
       - name: Build tests