Test setup with system cityhash in Linux workflow

Author: ZhongRuoyu

.github/workflows/linux.yml

@@ -58,15 +58,23 @@ jobs:
           C_COMPILER: gcc
           CXX_COMPILER: g++
           DEPENDENCIES_INSTALL: libabsl-dev liblz4-dev
+          HOMEBREW_DEPENDENCIES_INSTALL: cityhash
           DEPENDENCIES_CMAKE_OPTIONS: >-
             -D WITH_SYSTEM_LZ4=ON
             -D WITH_SYSTEM_ABSEIL=ON
+            -D WITH_SYSTEM_CITYHASH=ON
+            -D CMAKE_LIBRARY_PATH="$(brew --prefix cityhash)/lib"
+            -D CMAKE_CXX_FLAGS="-I$(brew --prefix cityhash)/include"
 
     runs-on: ${{matrix.os}}
 
     steps:
     - uses: actions/checkout@v2
 
+    - name: Set up Homebrew
+      uses: Homebrew/actions/setup-homebrew@master
+      if: matrix.HOMEBREW_DEPENDENCIES_INSTALL
+
     - name: Install dependencies
       run: |
         sudo apt-get update && \
@@ -76,6 +84,11 @@ jobs:
           ${{matrix.COMPILER_INSTALL}} \
           ${{matrix.DEPENDENCIES_INSTALL}}
 
+    - name: Install dependencies from Homebrew
+      if: matrix.HOMEBREW_DEPENDENCIES_INSTALL
+      run: |
+        brew install ${{matrix.HOMEBREW_DEPENDENCIES_INSTALL}}
+
     - name: Install dependencies - Docker
       run: |
         sudo apt remove -y docker docker-engine docker.io containerd runc
@@ -95,7 +108,7 @@ jobs:
           ${{matrix.SSL_CMAKE_OPTION}} \
           ${{matrix.DEPENDENCIES_CMAKE_OPTIONS}} \
           -S ${{github.workspace}} \
-          -B ${{github.workspace}}/build 
+          -B ${{github.workspace}}/build
 
     - name: Build project
       run: |