Add clang formatting job

.github/workflows/static_checks.yml

@@ -0,0 +1,33 @@
+# NOTE: The content of this file has been directly adapted from /godot-cpp/.workflows/static_checks.yml
+name: 📊 Static Checks
+on: [push, pull_request]
+
+jobs:
+  static-checks:
+    name: Format (clang-format)
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          lfs: true
+          submodules: recursive
+
+      # Azure repositories are not reliable, we need to prevent Azure giving us packages.
+      - name: Make apt sources.list use the default Ubuntu repositories
+        run: |
+          sudo rm -f /etc/apt/sources.list.d/*
+          sudo cp -f godot-cpp/misc/ci/sources.list /etc/apt/sources.list
+          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+          sudo apt-add-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-15 main"
+          sudo apt-get update
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get install -qq clang-format-15
+          sudo update-alternatives --remove-all clang-format || true
+          sudo update-alternatives --install /usr/bin/clang-format clang-format /usr/bin/clang-format-15 100
+
+      - name: Style checks via clang-format (clang_format.sh)
+        run: |
+          bash ./misc/scripts/clang_format.sh

misc/scripts/clang_format.sh

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+#!/usr/bin/env bash
+
+# This script runs clang-format on all relevant files in the repo.
+# This is the primary script responsible for fixing style violations.
+
+set -uo pipefail
+
+# Loops through all code files tracked by Git.
+git ls-files -- '*.c' '*.h' '*.cpp' '*.hpp' ':!:src/sqlite/*' |
+while read -r f; do
+    # Run clang-format.
+    clang-format --style=file:godot-cpp/.clang-format --Wno-error=unknown -i "$f"
+done
+
+diff=$(git diff --color)
+
+# If no patch has been generated all is OK, clean up, and exit.
+if [ -z "$diff" ] ; then
+    printf "Files in this commit comply with the clang-tidy style rules.\n"
+    exit 0
+fi
+
+# A patch has been created, notify the user, clean up, and exit.
+printf "\n*** The following changes have been made to comply with the formatting rules:\n\n"
+echo "$diff"
+printf "\n*** Please fix your commit(s) with 'git commit --amend' or 'git rebase -i <hash>'\n"
+exit 1