ci: log CPU details when testing (#7574)

* ci: log CPU details when testing

When testing, there are certain CPU-dependent features that influence
Cranelift's codegen (e.g., availability of AVX512 instructions). This
additional CI step logs the current CPU information to aid in
troubleshooting, such as the MPK-related troubleshooting over in #7445.
Also, if we let this run in CI for a while, we may be able to run
queries on the logs to determine how often jobs run on servers with
certain features enabled.

prtest:full

* Add Windows variant of 'lscpu'

* Add MacOS variant of 'lscpu'

.github/workflows/main.yml

@@ -475,6 +475,19 @@ jobs:
       run: |
         diff -ru crates/wasi/wit crates/wasi-http/wit
 
+    # Record some CPU details; this is helpful information if tests fail due
+    # to CPU-specific features.
+    - name: CPU information
+      run: lscpu
+      if: matrix.os == 'ubuntu-latest'
+    - name: CPU information
+      run: sysctl hw
+      if: matrix.os == 'macos-latest'
+    - name: CPU information
+      run: wmic cpu list /format:list
+      shell: pwsh
+      if: matrix.os == 'windows-latest'
+
     # Build and test all features
     - run: ./ci/run-tests.sh --locked
       env: