Add CI step to run performance regression test

Author: feliwir

.github/workflows/bench.yml

@@ -0,0 +1,58 @@
+name: bench-linux
+
+on:
+  pull_request:
+  push:
+
+permissions:
+  # deployments permission to deploy GitHub pages website
+  deployments: write
+  # contents permission to update benchmark contents in gh-pages branch
+  contents: write
+
+jobs:
+  create_release:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Create Development release
+        if: ${{ github.event_name != 'pull_request' && github.ref == 'refs/heads/develop' }}
+        uses: "marvinpinto/action-automatic-releases@latest"
+        with:
+          repo_token: "${{ secrets.GITHUB_TOKEN }}"
+          automatic_release_tag: "latest"
+          prerelease: true
+          title: "Development Build"
+
+  build_thyme_ubuntu:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: "recursive"
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update && sudo apt-get install -y libgtk-3-dev ninja-build libwxgtk3.0-gtk3-dev libsdl2-dev libavcodec-dev libavformat-dev
+
+      - name: Configure Thyme
+        run: |
+          cmake -DSTANDALONE=ON -DCMAKE_BUILD_TYPE=Release -DBUILD_BENCHMARKS=ON -B build -G Ninja
+
+      - name: Build Thyme
+        run: |
+          cmake --build build
+
+      - name: Bench Thyme
+        run: |
+          cd build
+          ./thyme_benchmarks --benchmark_format=json | tee benchmark_result.json
+
+      - name: Store benchmark result
+        uses: benchmark-action/github-action-benchmark@v1
+        with:
+          name: Thyme Benchmarks
+          tool: 'googlecpp'
+          output-file-path: build/benchmark_result.json
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          auto-push: true

CMakeLists.txt

@@ -417,6 +417,16 @@ if(DLL_INSTALL_PREFIX AND ${CMAKE_VERSION} VERSION_GREATER "3.13.0")
 endif()
 
 # Build tests
+if(BUILD_TESTS OR BUILD_BENCHMARKS)
+    FetchContent_Declare(
+        googletest
+        GIT_REPOSITORY https://github.com/google/googletest.git
+        GIT_TAG        release-1.12.1
+    )
+    
+    FetchContent_MakeAvailable(googletest)
+endif()
+
 if(BUILD_TESTS)
     enable_testing()
     add_subdirectory(tests)

tests/CMakeLists.txt

@@ -1,11 +1,3 @@
-FetchContent_Declare(
-  googletest
-  GIT_REPOSITORY https://github.com/google/googletest.git
-  GIT_TAG        release-1.12.1
-)
-
-FetchContent_MakeAvailable(googletest)
-
 set(TEST_SRCS
   main.cpp
   globals.cpp