Add a helper function to run apt-get

This simplifies the script and allows to log the commands in the build
log.

build/tools/before_install.sh

@@ -9,8 +9,13 @@ SUDO=sudo
 case $(uname -s) in
     Linux)
         if [ -f /etc/apt/sources.list ]; then
-            # Disable some (but not all) output.
-            apt_quiet='-q -o=Dpkg::Use-Pty=0'
+            run_apt() {
+                echo "Running apt-get $@"
+
+                # Disable some (but not all) output.
+                $SUDO apt-get -q -o=Dpkg::Use-Pty=0 "$@"
+
+            }
 
             if [ "$wxUSE_ASAN" = 1 ]; then
                 codename=$(lsb_release --codename --short)
@@ -21,7 +26,7 @@ case $(uname -s) in
 
                 # Import the debug symbol archive signing key from the Ubuntu server.
                 # Note that this command works only on Ubuntu 18.04 LTS and newer.
-                $SUDO apt-get $apt_quiet install -y ubuntu-dbgsym-keyring
+                run_apt install -y ubuntu-dbgsym-keyring
 
                 # The key in the package above is currently (2021-03-22) out of
                 # date, so get the latest key manually (this is completely
@@ -32,7 +37,7 @@ case $(uname -s) in
                 pkg_install='libfontconfig1-dbgsym libglib2.0-0-dbgsym libgtk-3-0-dbgsym libatk-bridge2.0-0-dbgsym'
             fi
 
-            $SUDO apt-get $apt_quiet update
+            run_apt update
 
             case "$wxCONFIGURE_FLAGS" in
                 *--with-directfb*) libtoolkit_dev='libdirectfb-dev'         ;;
@@ -71,7 +76,7 @@ case $(uname -s) in
                 fi
             done
 
-            $SUDO apt-get $apt_quiet install -y $pkg_install
+            run_apt install -y $pkg_install
         fi
         ;;