Envoy Integration Test Windows

.changelog/18007.txt

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+```release-note:improvement
+Windows: Integration tests for Consul Windows VMs
+```

.github/scripts/get_runner_classes_windows.sh

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+#!/usr/bin/env bash
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
+#
+# This script generates tag-sets that can be used as runs-on: values to select runners.
+
+set -euo pipefail
+
+case "$GITHUB_REPOSITORY" in
+    *-enterprise)
+        # shellcheck disable=SC2129
+        echo "compute-small=['self-hosted', 'windows', 'small']" >> "$GITHUB_OUTPUT"
+        echo "compute-medium=['self-hosted', 'windows', 'medium']" >> "$GITHUB_OUTPUT"
+        echo "compute-large=['self-hosted', 'windows', 'large']" >> "$GITHUB_OUTPUT"
+        # m5d.8xlarge is equivalent to our xl custom runner in OSS
+        echo "compute-xl=['self-hosted', 'ondemand', 'windows', 'type=m5d.8xlarge']" >> "$GITHUB_OUTPUT"
+        ;;
+    *)
+        # shellcheck disable=SC2129
+        echo "compute-small=['windows-2019']" >> "$GITHUB_OUTPUT"
+        echo "compute-medium=['windows-2019']" >> "$GITHUB_OUTPUT"
+        echo "compute-large=['windows-2019']" >> "$GITHUB_OUTPUT"
+        echo "compute-xl=['windows-2019']" >> "$GITHUB_OUTPUT"
+        ;;
+esac

.github/workflows/reusable-dev-build-windows.yml

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+name: reusable-dev-build-windows
+
+on:
+  workflow_call:
+    inputs:
+      uploaded-binary-name:
+        required: false
+        type: string
+        default: "consul.exe"
+      runs-on:
+        description: An expression indicating which kind of runners to use.
+        required: true
+        type: string
+      repository-name:
+        required: true
+        type: string
+      go-arch:
+        required: false
+        type: string
+        default: ""
+    secrets:
+      elevated-github-token:
+        required: true
+jobs:
+  build:
+    runs-on: 'windows-2019'
+    steps:
+      - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
+      # NOTE: This step is specifically needed for ENT. It allows us to access the required private HashiCorp repos.
+      - name: Setup Git
+        if: ${{ endsWith(inputs.repository-name, '-enterprise') }}
+        run: git config --global url."https://${{ secrets.elevated-github-token }}:@github.com".insteadOf "https://github.com"
+      - uses: actions/setup-go@fac708d6674e30b6ba41289acaab6d4b75aa0753 # v4.0.1
+        with:
+          go-version-file: 'go.mod'
+      - name: Build
+        env:
+          GOARCH: ${{ inputs.goarch }}
+        run: go build .
+      # save dev build to pass to downstream jobs
+      - uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
+        with:
+          name: ${{inputs.uploaded-binary-name}}
+          path: consul.exe
+      - name: Notify Slack
+        if: ${{ failure() }}
+        run: .github/scripts/notify_slack.sh