Re-add things that were accidentally removed

.gitattributes

@@ -0,0 +1,11 @@
+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf
+
+# Ignore some files when exporting.
+/.github                   export-ignore
+/.gitattributes            export-ignore
+/default_env.tres          export-ignore
+/icon.png                  export-ignore
+/icon.png.import           export-ignore
+/project.godot             export-ignore
+/README.md                 export-ignore

.github/workflows/file_format.sh

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+#!/usr/bin/env bash
+
+# This script ensures proper POSIX text file formatting and a few other things.
+
+# We need dos2unix and recode.
+if [ ! -x "$(command -v dos2unix)" -o ! -x "$(command -v recode)" ]; then
+	printf "Install 'dos2unix' and 'recode' to use this script.\n"
+fi
+
+set -uo pipefail
+IFS=$'\n\t'
+
+# Loops through all text files tracked by Git.
+git grep -zIl '' |
+while IFS= read -rd '' f; do
+	# Exclude some files.
+	if [[ "$f" == *"csproj"* ]]; then
+		continue
+	fi
+	# Ensure that files are UTF-8 formatted.
+	recode UTF-8 "$f" 2> /dev/null
+	# Ensure that files have LF line endings and do not contain a BOM.
+	dos2unix "$f" 2> /dev/null
+	# Remove trailing space characters and ensures that files end
+	# with newline characters. -l option handles newlines conveniently.
+	perl -i -ple 's/\s*$//g' "$f"
+	# We don't want to change lines around braces in godot/tscn files.
+	if [[ "$f" == *"godot" ]]; then
+		continue
+	elif [[ "$f" == *"tscn" ]]; then
+		continue
+	fi
+done
+
+git diff > patch.patch
+
+# If no patch has been generated all is OK, clean up, and exit.
+if [ ! -s patch.patch ] ; then
+	printf "Files in this commit comply with the formatting rules.\n"
+	rm -f patch.patch
+	exit 0
+fi
+
+# A patch has been created, notify the user, clean up, and exit.
+printf "\n*** The following differences were found between the code "
+printf "and the formatting rules:\n\n"
+cat patch.patch
+printf "\n*** Aborting, please fix your commit(s) with 'git commit --amend' or 'git rebase -i <hash>'\n"
+rm -f patch.patch
+exit 1

.github/workflows/static_checks.yml

@@ -0,0 +1,19 @@
+name: 📊 Static Checks
+on: [push, pull_request]
+
+jobs:
+  format:
+    name: File formatting (file_format.sh)
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update -qq
+          sudo apt-get install -qq dos2unix recode
+
+      - name: File formatting checks (file_format.sh)
+        run: |
+          bash ./.github/workflows/file_format.sh

.gitignore

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+# Godot 4+ specific ignores
+.godot/
+
+# Godot-specific ignores
+.import/
+
+# Imported translations (automatically generated from CSV files)
+*.translation
+
+# Mono-specific ignores
+.mono/
+data_*/
+mono_crash.*.json
+
+# System/tool-specific ignores
+.directory
+*~