Add libgd-dev to CI dependencies

Author: adazem009

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Install dependencies
       run: |
         sudo apt-get update
-        sudo apt-get install -y nlohmann-json3-dev libutfcpp-dev
+        sudo apt-get install -y nlohmann-json3-dev libutfcpp-dev libgd-dev
       shell: bash
     - name: Configure CMake
       run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}

.github/workflows/utests.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Install dependencies
       run: |
         sudo apt-get update
-        sudo apt-get install -y nlohmann-json3-dev libutfcpp-dev
+        sudo apt-get install -y nlohmann-json3-dev libutfcpp-dev libgd-dev
       shell: bash
     - name: Configure CMake
       run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DLIBSCRATCHCPP_BUILD_UNIT_TESTS=ON