ci: another windows pre-test check

Run a test script without perl/prove before attempting to run `make
prove`. This is meant to help narrow down the cause of the next,
inevitable msys2 breakage.

.github/workflows/ci.yml

@@ -232,6 +232,14 @@ jobs:
         shell: msys2 {0}
         run: |
           cargo --locked --quiet run --profile=release -- version
+      - name: Pre-test Check 2
+        shell: msys2 {0}
+        env:
+          STG_PROVE_OPTS: "--jobs=2"
+          STG_TEST_OPTS: "--verbose-log"
+          STG_PROFILE: "release"
+        run: |
+          make -C t t0000-init.sh
       - name: Test
         shell: msys2 {0}
         env: