Update nightly.yaml for Azure Pipelines

scripts/nightly.yaml

@@ -98,12 +98,14 @@ stages:
           image: "quay.io/pypa/musllinux_1_1_x86_64:latest"
           python: "/opt/python/cp310-cp310/bin/python"
       maxParallel: 2
+    variables:
+      python: $(python)
+      name: $(name)
+      image: $(image)      
     displayName: "$(name) build"
     pool:
       vmImage: "Ubuntu-18.04"
-    container: $(image)
-    variables:
-      python: $(python)
+    container: "quay.io/pypa/manylinux2010_x86_64:latest"
     steps:
     - script: $(python) scripts/mk_unix_dist.py --nodotnet --nojava
     - script: git clone https://github.com/z3prover/z3test z3test