Log environment on CI machines

log-env.sh is cross-platform (works on Linux, MacOS and Windows)

log-env.ps1 is Windows-only and requirs specifying pwsh shell, but
provides some Windows-specific information, that might be useful e.g.
for MSVC builds.

scripts/log-env.ps1

@@ -0,0 +1,13 @@
+# To use this script in GitHub Actions job:
+#
+#  - name: "Log environment"
+#    shell: pwsh
+#    run: .\scripts\log-env.ps1
+#
+# This script works only on Windows.
+# see also script: log-env.sh
+
+Set-PSDebug -Trace 1
+systeminfo
+gci env:
+Set-PSDebug -Trace 0