build(test): add PyCall build in CI

Add conditional logic to build PyCall package when running in CI environment,
ensuring proper setup for tests that depend on Python interoperability.

Author: Christopher Doris

test/runtests.jl

@@ -1,3 +1,9 @@
+if get(ENV, "CI", "") != ""
+    @info "Building PyCall in CI"
+    using Pkg
+    Pkg.build("PyCall")
+end
+
 using TestItemRunner
 
 @run_package_tests