Update GitHub Actions workflows. (#828)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit 04eba5a7401003d8d00e1b5c45c156c05b1d9dfe.

Author: pulumi-bot

.config/mise.test.toml

@@ -1,6 +1,10 @@
 # WARNING: This file is autogenerated - changes will be overwritten when regenerated by https://github.com/pulumi/ci-mgmt
 
-# Overrides tool versions for test workflows
+# Overrides for test workflows
+
+[env]
+# Acceptance (specifically providertest) tests require that PULUMI_HOME be the default
+PULUMI_HOME = "{{ env.HOME }}/.pulumi"
 
 [tools]
 # always use pulumi latest for tests