Cmake with OCR and Hardsubx in different job

.github/workflows/build_linux.yml

@@ -51,6 +51,15 @@ jobs:
       run: make
       working-directory: ./linux
   cmake:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: cmake
+      run: mkdir build && cd build && cmake ../src
+    - name: build
+      run: make -j$(nproc)
+      working-directory: build
+  cmake_ocr_hardsubx:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1