Minor improvement to ci

Author: Heliozoa

.github/workflows/linux.yml

@@ -55,7 +55,7 @@ jobs:
         run: |
           export I686_UNKNOWN_LINUX_GNU_OPENSSL_LIB_DIR=/usr/lib/i386-linux-gnu # required to build for 32-bit arch
           export I686_UNKNOWN_LINUX_GNU_OPENSSL_INCLUDE_DIR=/usr/include/i386-linux-gnu # required to build for 32-bit arch
-          rustup target add i686-unknown-linux-gnu
+          rustup target add ${{ matrix.target }}
           cargo build -p tmc --release --verbose --target ${{ matrix.target }}
 
       - name: Get the version