[ci]: Add workflow to guard against growing bundle size

.github/workflows/check_bundle.yml

@@ -0,0 +1,74 @@
+name: Bundle Size Check
+
+on:
+  pull_request:
+    branches: [main]
+
+  push:
+    branches: [main]
+
+jobs:
+  build-and-check:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: packages/jaeger-ui
+
+    steps:
+      - uses: actions/checkout@v4 # v4.2.1
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4 # v4.1.0
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Calculate bundle size
+        run: |
+          TOTAL_SIZE=$(du -sb build | cut -f1)
+          echo "$TOTAL_SIZE" > new_bundle_size.txt
+          echo "Total bundle size: $TOTAL_SIZE bytes"
+      - name: Restore previous bundle size
+        id: cache-bundle-size
+        uses: actions/cache@v4
+        with:
+          path: /home/runner/work/jaeger-ui/jaeger-ui/packages/jaeger-ui/bundle_size.txt
+          key: bundle-size-jaeger-ui
+
+      - name: Compare bundle sizes
+        run: |
+          if [ -f bundle_size.txt ]; then
+            OLD_BUNDLE_SIZE=$(cat bundle_size.txt)
+            NEW_BUNDLE_SIZE=$(cat new_bundle_size.txt)
+            echo "Previous bundle size: $OLD_BUNDLE_SIZE bytes"
+            echo "New bundle size: $NEW_BUNDLE_SIZE bytes"
+
+            SIZE_CHANGE=$(( $NEW_BUNDLE_SIZE - $OLD_BUNDLE_SIZE ))
+            PERCENTAGE_CHANGE=$(( SIZE_CHANGE * 100 / $OLD_BUNDLE_SIZE ))
+            echo "Size change: $PERCENTAGE_CHANGE%"
+            if [ $PERCENTAGE_CHANGE -gt 2 ]; then
+              echo "❌ Bundle size increased by more than 2% ($PERCENTAGE_CHANGE%)"
+              exit 1
+            else
+              echo "✅ Bundle size change is within acceptable range ($PERCENTAGE_CHANGE%)"
+            fi
+          else
+            echo "No previous bundle size found. This will be the baseline."
+          fi
+      - name: Remove previous *_bundle_*.txt
+        run: |
+          rm -rf bundle_size.txt
+          mv new_bundle_size.txt bundle_size.txt
+
+      - name: Save new bundle size
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        uses: actions/cache/save@v4
+        with:
+          path: /home/runner/work/jaeger-ui/jaeger-ui/packages/jaeger-ui/bundle_size.txt
+          key: bundle-size-jaeger-ui