Mark python so it isn't changed

Author: tannewt

.github/actions/deps/ports/zephyr-cp/action.yml

@@ -26,10 +26,7 @@ runs:
         echo "--- package repository versions ---"
         apt-cache policy
         sudo apt-get install -y libusb-1.0-0-dev libudev-dev pkg-config mtools
-        # Remove system python3 to avoid conflict with python3:i386 which is
-        # pulled in by libsdl2-dev:i386 -> libibus-1.0-dev:i386 -> libglib2.0-dev:i386.
-        # We use the actions/setup-python version from /opt/hostedtoolcache instead.
-        sudo apt-get remove -y python3 python3-minimal || true
+        sudo apt-mark hold python3
         sudo apt-get install -y libsdl2-dev:i386 libsdl2-image-dev:i386
         echo "PKG_CONFIG_PATH=/usr/lib/i386-linux-gnu/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}" >> $GITHUB_ENV
       shell: bash