[CI]: Restructure and Standardize the preview-deploy workflow across repos subscribed to the meshery-academy topic.

.github/workflows/preview-build-pr.yml

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+name: preview-build-pr
+
+on:
+  pull_request:
+    branches: [master]
+    types: [opened, synchronize, reopened]
+
+permissions: {}
+
+concurrency:
+  group: preview-build-pr-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    permissions:
+      contents: read
+    # Local reference for now; point at the central repo once published:
+    #   uses: <org>/<central-repo>/.github/workflows/preview-build.yml@<pinned-sha>
+    uses: ./.github/workflows/preview-build.yml
+    with:
+      deployment-url: https://${{ github.repository_owner }}.github.io/${{ github.event.repository.name }}

.github/workflows/preview-build.yml

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+name: preview-build
+
+on:
+  workflow_call:
+    inputs:
+      deployment-url:
+        description: Base URL of the calling repo's GitHub Pages site, no trailing slash (e.g. https://owner.github.io/repo).
+        required: true
+        type: string
+
+permissions: {}
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout PR code
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+
+      - name: Setup Go
+        uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
+        with:
+          go-version-file: go.mod
+
+      - name: Setup Node
+        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
+        with:
+          node-version: '22'
+          cache: npm
+
+      - name: Setup Hugo
+        uses: peaceiris/actions-hugo@2752ce1d29631191ea3f27c23495fa06139a5b78 # v3.2.1
+        with:
+          hugo-version: '0.158.0'
+          extended: true
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build preview
+        env:
+          BASE_URL: ${{ inputs.deployment-url }}/pr-preview/pr-${{ github.event.pull_request.number }}/
+        run: |
+          set -euo pipefail
+          hugo \
+            --cleanDestinationDir \
+            --environment dev \
+            --buildDrafts \
+            --buildFuture \
+            --buildExpired \
+            --minify \
+            --baseURL "$BASE_URL"
+
+      - name: Upload preview artifact
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: preview-site
+          path: public
+          retention-days: 1
+          if-no-files-found: error