Make the build parallel so I can use all 32 cores on my desktop :p

mini-cross-build.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -ex
+for spark_version in 2.4.8 3.0.0 3.0.1 3.0.2 3.1.1 3.1.2 3.1.3 3.2.0 3.2.1 3.2.2 3.2.3 3.2.4 3.3.0 3.3.1 3.3.2 3.4.0
+    do
+    build_dir="/tmp/spark-testing-base-$spark_version"
+    mkdir -p "${build_dir}"
+    cp -af ./ "${build_dir}"
+    cd ${build_dir}
+    sbt  -DsparkVersion=$spark_version version clean +publishLocal +publishSigned &
+    cd -
+done
+wait