add build automation scripts

dist/BUILD_TEMPLATE.sh

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+#!/bin/bash
+
+# (c) 2023-present Eroax
+# (c) 2023-present Yagich
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+# Template script to build StreamGraph for Linux and Windows targets.
+# While it can be invoked manually, it's part of a series of automation scripts.
+# This script is tailor-made for one system and may not necessarily work on others.
+# If you want a safer way to build StreamGraph, use Godot's Export menu.
+
+# This script is copied to a version folder as part of the build process.
+# It will not try detecting that the folder it's in is valid, so do not run it if it's named "BUILD_TEMPLATE.sh".
+# It expects a "godot" executable to be present in PATH.
+
+# If the first argument is "clean", the script will remove the built executables in the linux/ and windows/ folders and zip files it creates.
+
+target=`pwd`
+version=`basename $target`
+filename="StreamGraph-v$version"
+
+# Build StreamGraph for linux and windows and zip them up.
+function build {
+  if ! command -v godot &> /dev/null; then
+    echo "ERROR: godot not found in PATH. Aborting."
+    exit 1
+  fi
+
+  cd ../../
+  godot --headless --quiet --export-debug "linux" "$target/linux/$filename.x86_64"
+  godot --headless --quiet --export-debug "windows" "$target/windows/$filename.exe"
+
+  cd "$target"
+  zip -rq "$filename-linux.zip" linux
+  zip -rq "$filename-windows.zip" windows
+  exit 0
+}
+
+# Clean the linux and windows folders and zip files.
+function clean {
+  rm -f windows/*
+  rm -f linux/*
+  rm -f "$filename-linux.zip"
+  rm -f "$filename-windows.zip"
+  exit 0
+}
+
+if [[ $1 = "clean" ]]; then
+  clean
+else
+  build
+fi

dist/build-version.sh

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+#!/bin/bash
+
+# (c) 2023-present Eroax
+# (c) 2023-present Yagich
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+# Main script to build a given version of StreamGraph for Linux and Windows.
+# See the files prep-folders.sh and BUILD_TEMPLATE.sh for more information on what happens during the build process.
+
+if [[ $# -ne 1 ]]; then
+  echo "ERROR: Version string required."
+  exit 2
+fi
+
+./prep-folders.sh $1
+
+cd "$1"
+
+./build.sh clean
+./build.sh
+
+if [[ $? = 0 ]]; then
+  echo "Build completed."
+  exit 0
+else
+  echo "Build failed."
+  exit $?
+fi

dist/prep-folders.sh

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+#!/bin/bash
+
+# (c) 2023-present Eroax
+# (c) 2023-present Yagich
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+# Helper script to prepare folders for a StreamGraph release.
+# Takes one argument, the version string, and creates a relevant folder structure, copying the build template into the version folder.
+
+if [[ $# -ne 1 ]]; then
+  echo "ERROR: Version string required."
+  exit 2
+fi
+
+if [[ -d $1 ]]; then
+  echo "WARN: The directory for version $1 already exists."
+  cp BUILD_TEMPLATE.sh "$1/build.sh"
+  exit 1
+fi
+
+mkdir -p "$1"/linux
+mkdir -p "$1"/windows
+
+cp BUILD_TEMPLATE.sh "$1/build.sh"