chore: Add a full-build shell script for use in CI/docker (#5167)

.CI/full-ubuntu-build.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+set -e
+
+mkdir build
+cmake -B build
+CXXFLAGS=-fno-sized-deallocation cmake \
+    -B build \
+    -DCMAKE_INSTALL_PREFIX=appdir/usr/ \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DUSE_PRECOMPILED_HEADERS=OFF \
+    -DCMAKE_EXPORT_COMPILE_COMMANDS=On \
+    -DCHATTERINO_PLUGINS="$C2_PLUGINS" \
+    -DCMAKE_PREFIX_PATH="$Qt6_DIR/lib/cmake" \
+    -DBUILD_WITH_QT6="$C2_BUILD_WITH_QT6" \
+    ..
+cmake --build build
+
+# TODO: Test appimage/deb creation
+# sh ./../.CI/CreateAppImage.sh
+# sh ./../.CI/CreateUbuntuDeb.sh