message: ci(archlinux): clean up build script and add comments
diff: #!/bin/sh
  -set -o errexit -o pipefail
  +set -e
  -export cpuCount=$(awk '/^processor/{n+=1}END{print n}' /proc/cpuinfo)
  +### Prepare
  +cpuCount=`grep -c -w ^processor /proc/cpuinfo`
  git submodule update --init --recursive
  mkdir -p build
  -cd build && cmake .. \
  +cd build
  +cmake .. \
  -GNinja \
  -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=g++ \
  -DYAML_BUILD_SHARED_LIBS=OFF -DYAML_CPP_BUILD_CONTRIB=OFF \
  -DYAML_CPP_BUILD_TESTS=OFF -DYAML_CPP_BUILD_TOOLS=OFF \
  -DYAML_CPP_INSTALL=OFF
  +###
  +
  +### Build Code
  ninja -j$cpuCount
  +###
  +
  +### Remove unneeded Symbols
  strip src/contour/contour
  +###
  +### Create result artifact
  cd ..
  -
  mkdir artifact
  mv build/src/contour/contour artifact
  @@ -22,3 +31,4 @@ mv src/contour/contour.desktop artifact
  mv src/contour/res/images/contour-logo.png artifact
  tar --zstd -cfcontour.tar.zst -C artifact contour contour.desktop contour-logo.png
  +###
  