ci: Cross tests - run numeric as release, use s390x

Somehow, these take 30m on powerpc, which is too slow (much slower than
anything else.)

Try to use s390x instead and run numeric tests in release mode.

Author: bluss

.github/workflows/ci.yaml

@@ -54,7 +54,7 @@ jobs:
       matrix:
         include:
           - rust: stable
-            target: powerpc-unknown-linux-gnu
+            target: s390x-unknown-linux-gnu
           - rust: stable
             target: i686-unknown-linux-gnu
 

scripts/cross-tests.sh

@@ -11,4 +11,4 @@ cross build -v --features="$FEATURES" --target=$TARGET
 cross test -v --no-fail-fast --features="$FEATURES" --target=$TARGET
 cross test -v --no-fail-fast --target=$TARGET --manifest-path=ndarray-rand/Cargo.toml --features quickcheck
 cross test -v --no-fail-fast --target=$TARGET --manifest-path=xtest-serialization/Cargo.toml --verbose
-cross test -v --no-fail-fast --target=$TARGET --manifest-path=xtest-numeric/Cargo.toml
+cross test -v --no-fail-fast --target=$TARGET --manifest-path=xtest-numeric/Cargo.toml --release