see if this fixes the issue with s390x.

.github/workflows/s390x.yml

diff --git a/.github/workflows/s390x.yml b/.github/workflows/s390x.yml
index 91918f3..0bc90d9 100644
--- a/.github/workflows/s390x.yml
+++ b/.github/workflows/s390x.yml
@@ -22,7 +22,7 @@
           distro: ubuntu_latest
           install: |
             apt-get update -q -y
-            apt-get install -y cmake make g++
+            apt-get install -y cmake make g++ git
           run: |
             cmake -DCMAKE_BUILD_TYPE=Release -B build  -DFASTFLOAT_TEST=ON
             cmake --build build -j=2