[Feature] Add Github actions workflow

.github/workflows/cmake-single-platform.yml

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+# This starter workflow is for a CMake project running on a single platform. There is a different starter workflow if you need cross-platform coverage.
+# See: https://github.com/actions/starter-workflows/blob/main/ci/cmake-multi-platform.yml
+name: Basic Tests for BLISS Benchmark
+
+on:
+  push:
+    branches: 
+      - "main"
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    # The CMake configure and build commands are platform agnostic and should work equally well on Windows or Mac.
+    # You can convert this to a matrix build if you need cross-platform coverage.
+    # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+      with: 
+        submodules: 'true'
+        token: ${{ secrets.ACTIONS_ACCESS_TOKEN }}
+
+    - name: Configure CMake
+      # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
+      # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
+
+    - name: Build
+      # Build your program with the given configuration
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
+
+    - name: Verify Tests Exist
+
+      working-directory: ${{github.workspace}}/tests
+      run: sh unit_test_exists.sh
+
+    - name: Test
+      working-directory: ${{github.workspace}}/build
+      # Execute tests defined by the CMake configuration.
+      # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
+      run: ctest -C ${{env.BUILD_TYPE}}
+

tests/unit_test_exists.sh

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+
+# boolean flag to check if test passed
+test_passed=true
+
+# loop through all files in src/bliss directory excluding subdirectories
+for file in $(find ../src/bliss -type f -name "bench_*.h"); do
+    # get the filename without the path
+    filename=$(basename $file)
+    # get the filename without the extension
+    filename_no_ext="${filename%.*}"
+    # get index name from filename which is of format bench_<index>.h
+    index=$(echo $filename_no_ext | cut -d'_' -f2)
+
+    # check if the test folder exists 
+    if [ ! -d "test_$index" ]; then
+        echo "tests/test_$index/ directory does not exist"
+        test_passed=false
+        break
+    else 
+        # check if test folder contains a CMakeLists.txt or <index>_tests.cpp file
+        if [ ! -f "test_$index/CMakeLists.txt" ] && [ ! -f "test_$index/${index}_tests.cpp" ]; then
+            echo "tests/test_$index/ directory does not contain CMakeLists.txt or ${index}_tests.cpp file"
+            test_passed=false
+            break
+        fi
+    fi
+done
+
+if [ "$test_passed" = true ]; then
+    echo "unit tests exist for all indexes"
+fi