feat(CI): add CI for the test.

.github/workflows/test.yaml

@@ -0,0 +1,18 @@
+on: 
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build_latex:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: xu-cheng/texlive-action/full@v1
+        with:
+          run: |
+            apk add make
+            make test