👷 Add Test Build workflow

.github/workflows/test-build.yml

@@ -0,0 +1,24 @@
+name: Test Build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.ref }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: true
+          fetch-depth: 0
+
+      - name: Setup Hugo
+        uses: peaceiris/actions-hugo@v2
+        with:
+          hugo-version: "latest"
+
+      - name: Build
+        working-directory: ./exampleSite
+        run: hugo --minify --themesDir ../.. --baseURL https://jpanther.github.io/congo/