Improve/fix CI

.github/workflows/ci.yaml

@@ -15,7 +15,10 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        rust: [stable, nightly]
+        rust:
+          - 1.70.0 # MSRV
+          - stable
+          - nightly
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
@@ -35,21 +38,29 @@ jobs:
       # This is useful for debugging problems when the expected build artifacts
       # (like shell completions and man pages) aren't generated.
       - name: Show build.rs stderr
-        if: matrix.os == 'windows-latest'
         shell: bash
         run: |
-          set +x
-          mapfile -d '' -t STDERR_FILES < <(find "./target/debug" -name stderr -print0 | grep -z bandwhich)
-          for FILE in "${STDERR_FILES[@]}"; do
-            echo "===== $FILE ===== "
+          # it's probably okay to assume no spaces?
+          STDERR_FILES=$(find "./target/debug" -name stderr | grep bandwhich)
+          for FILE in $STDERR_FILES; do
+            echo "::group::$FILE"
             cat "$FILE"
-            echo "====="
+            echo "::endgroup::"
           done
-          set -x
 
       - name: Run clippy
         run: cargo clippy --all-targets --all-features -- -D warnings
 
+      - name: Install npcap on Windows
+        if: matrix.os == 'windows-latest'
+        env:
+          NPCAP_OEM_URL: ${{ secrets.NPCAP_OEM_URL }}
+        run: |
+          Invoke-WebRequest -Uri "$env:NPCAP_OEM_URL" -OutFile "$env:TEMP/npcap-oem.exe"
+          # for this ridiculous `&` syntax alone, I'd rather use COBOL than Powershell
+          # see https://stackoverflow.com/a/1674950/5637701
+          & "$env:TEMP/npcap-oem.exe" /S
+
       - name: Run tests
         run: cargo test --verbose