Add initial CI workflow for code style conformance (#2)

Added a GitHub workflow to check for code style, copyrights, imports.

.clang-format

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+BasedOnStyle: Google
+ColumnLimit: 100
+BinPackParameters: false
+AllowAllParametersOfDeclarationOnNextLine: true
+ObjCSpaceBeforeProtocolList: true
+SpacesInContainerLiterals: true
+PointerAlignment: Right
+AllowShortFunctionsOnASingleLine: None
+IncludeBlocks: Preserve

.github/workflows/check.yml

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+name: check
+
+on:
+  pull_request:
+    paths:
+    - '.github/workflows/check.yml'
+  push:
+    branches: main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check:
+    runs-on: macos-latest
+    env:
+      MINT_PATH: ${{ github.workspace }}/mint
+    steps:
+    - uses: actions/checkout@v3
+
+    - uses: actions/setup-python@v3
+      with:
+        python-version: 3.6
+
+    - name: Cache Mint packages
+      uses: actions/cache@v3
+      with:
+        path: ${{ env.MINT_PATH }}
+        key: ${{ runner.os }}-mint-${{ hashFiles('**/Mintfile') }}
+        restore-keys: ${{ runner.os }}-mint-
+
+    - name: Setup Scripts Directory
+      run: ./setup-scripts.sh
+
+    - name: Setup check
+      run: |
+        brew update
+        brew install clang-format@16
+        brew install mint
+        mint bootstrap
+
+    - name: Style
+      run: scripts/style.sh test-only
+
+    - name: Whitespace
+      run: scripts/check_whitespace.sh
+
+    - name: Filename spaces
+      run: scripts/check_filename_spaces.sh
+
+    - name: Copyrights
+      run: scripts/check_copyright.sh
+
+    - name: Imports
+      run: scripts/check_imports.swift

.gitignore

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+# macOS
+.DS_Store
+
+# Xcode
+build/
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+*.xccheckout
+profile
+*.moved-aside
+DerivedData
+*.hmap
+*.ipa
+
+# Swift Package Manager
+.build
+Package.resolved
+
+# Mint package manager
+Mint
+
+# Vim
+*.swo
+*.swp
+*~
+
+# Bundler
+/.bundle
+/vendor
+
+# CocoaPods
+Pods/
+Podfile.lock
+*.xcworkspace
+
+# CocoaPods generate
+gen/
+
+# firebase-ios-sdk clone
+firebase-ios-sdk/
+
+# scripts link
+scripts

Mintfile

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+nicklockwood/SwiftFormat@0.51.12

setup-scripts.sh

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+#!/bin/bash
+
+# Copyright 2021 Google LLC
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#      http://www.apache.org/licenses/LICENSE-2.0
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+git clone \
+  --depth 1 \
+  --no-checkout \
+  https://github.com/firebase/firebase-ios-sdk.git \
+;
+cd firebase-ios-sdk
+git checkout master -- scripts
+cd ..
+ln -s firebase-ios-sdk/scripts scripts
+
+gem install xcpretty