rtcheck: Add gdb

Author: drowaudio

.github/workflows/build.yaml

@@ -70,7 +70,7 @@ jobs:
         run: |
           sudo add-apt-repository ppa:ubuntu-toolchain-r/test
           sudo apt-get update
-          sudo apt-get install -y freeglut3-dev g++ libasound2-dev libcurl4-openssl-dev libfreetype6-dev libjack-jackd2-dev libx11-dev libxcomposite-dev libxcursor-dev libxinerama-dev libxrandr-dev mesa-common-dev ladspa-sdk webkit2gtk-4.0 libgtk-3-dev xvfb
+          sudo apt-get install -y freeglut3-dev g++ libasound2-dev libcurl4-openssl-dev libfreetype6-dev libjack-jackd2-dev libx11-dev libxcomposite-dev libxcursor-dev libxinerama-dev libxrandr-dev mesa-common-dev ladspa-sdk webkit2gtk-4.0 libgtk-3-dev xvfb gdb
           sudo /usr/bin/Xvfb $DISPLAY &
 
       - name: Make VST2 SDK available