Add a script to automatically generate and upload release

The script must be run from the godot-build-scripts directory
used to build Godot. It requires access to both folders to
read build artifacts from there and create commits here.

tools/upload-github.sh

@@ -0,0 +1,141 @@
+#!/bin/bash
+
+set -e
+
+# Generate GitHub release for a Godot version and upload artifacts.
+#
+# Usage: ./upload-github.sh -v 3.6
+# Usage: ./upload-github.sh -v 3.6 -f beta3
+# Usage: ./upload-github.sh -v 3.6 -f beta3 -r owner/repository
+#
+# Run this script from the root of the godot-build-scripts folder
+# after building Godot.
+
+# Folder this script is called from, a.k.a its working directory.
+export basedir=$(pwd)
+
+# Folder where this scripts resides in.
+scriptpath=$(readlink -f "$0")
+scriptdir=$(dirname "$scriptpath")
+# Root folder of this project, hopefully.
+export buildsdir=$(dirname "$scriptdir")
+
+if [ ! -d "${basedir}/releases" ] || [ ! -d "${basedir}/tmp" ]; then
+  echo "Cannot find one of the required folders: releases, tmp."
+  echo "  Make sure you're running this script from the root of your godot-build-scripts clone, and that Godot has been built with it."
+  exit 1
+fi
+
+# Setup.
+
+godot_version=""
+godot_flavor="stable"
+godot_repository="godotengine/godot-builds"
+
+while getopts "v:f:r:" opt; do
+  case "$opt" in
+  v)
+    godot_version=$OPTARG
+    ;;
+  f)
+    godot_flavor=$OPTARG
+    ;;
+  r)
+    godot_repository=$OPTARG
+    ;;
+  esac
+done
+
+release_tag="$godot_version-$godot_flavor"
+
+echo "Preparing release $release_tag..."
+
+version_path="$basedir/releases/$release_tag"
+if [ ! -d "${version_path}" ]; then
+  echo "Cannot find the release folder at $version_path."
+  echo "  Make sure you're running this script from the root of godot-build-scripts, and that Godot has been built."
+  exit 1
+fi
+
+cd git
+git_reference=$(git rev-parse HEAD)
+cd ..
+
+# Generate release metadata and commit it to Git.
+
+echo "Creating and committing release metadata for $release_tag..."
+
+if ! $buildsdir/tools/create-release-metadata.py -v $godot_version -f $godot_flavor -g $git_reference; then
+  echo "Failed to create release metadata for $release_tag."
+  exit 1
+fi
+
+cd $buildsdir
+git add ./releases/godot-$release_tag.json
+git commit -m "Add Godot $release_tag"
+git tag $release_tag
+if ! git push --atomic origin release-automation $release_tag; then
+  echo "Failed to push release metadata for $release_tag to GitHub."
+  exit 1
+fi
+cd $basedir
+
+# Exactly one time it failed to create release immediately after pushing the tag,
+# so we use this for protection...
+sleep 2
+
+# Generate GitHub release.
+
+echo "Creating and publishing GitHub release for $release_tag..."
+
+if ! $buildsdir/tools/create-release-notes.py -v $godot_version -f $godot_flavor -g $git_reference; then
+  echo "Failed to create release notes for $release_tag."
+  exit 1
+fi
+
+release_notes="$basedir/tmp/release-notes-$release_tag.txt"
+release_flag=""
+if [ $godot_flavor != "stable" ]; then
+  release_flag="--prerelease"
+fi
+
+if ! gh release create $release_tag --verify-tag --title "$release_tag" --notes-file $release_notes $release_flag -R $godot_repository; then
+  echo "Cannot create a GitHub release for $release_tag."
+  exit 1
+fi
+
+# Upload release files to GitHub.
+
+echo "Uploading release files from $version_path..."
+
+# We are picking up all relevant files lazily, using a substring.
+# The first letter can be in either case, so we're skipping it.
+for f in $version_path/*odot*; do
+  echo "Uploading $f..."
+  gh release upload $release_tag $f -R $godot_repository
+done
+
+# Do the same for .NET builds.
+for f in $version_path/mono/*odot*; do
+  echo "Uploading $f..."
+  gh release upload $release_tag $f -R $godot_repository
+done
+
+# README.txt is only generated for pre-releases.
+readme_path="$version_path/README.txt"
+if [ $godot_flavor != "stable" ] && [ -f "${readme_path}" ]; then
+  echo "Uploading $readme_path..."
+  gh release upload $release_tag $readme_path -R $godot_repository
+fi
+
+# SHA512-SUMS.txt is split into two: classic and mono, and we need to upload them as one.
+checksums_path="$basedir/tmp/SHA512-SUMS.txt"
+cp $basedir/releases/$release_tag/SHA512-SUMS.txt $checksums_path
+if [ -d "${basedir}/releases/${release_tag}/mono" ]; then
+  cat $basedir/releases/$release_tag/mono/SHA512-SUMS.txt >> $checksums_path
+fi
+
+echo "Uploading $checksums_path..."
+gh release upload $release_tag $checksums_path -R $godot_repository
+
+echo "Done."