Restore runs-on.

Author: notroj

.github/workflows/linux.yml

@@ -317,6 +317,7 @@ jobs:
               APU_CONFIG="--without-crypto"
             pkgs: subversion
           # -------------------------------------------------------------------------
+    runs-on: ${{ matrix.os }}
     timeout-minutes: 30
     env:
       NOTEST_CFLAGS: ${{ matrix.notest-cflags }}