BugFix - NPE internalFolderSyncTimestamp & File Existence Check #6603

	# synced from @nextcloud/android-config

	# SPDX-FileCopyrightText: 2022-2024 Nextcloud GmbH and Nextcloud contributors
	# SPDX-FileCopyrightText: 2023 Andy Scherzinger <info@andy-scherzinger.de>
	# SPDX-FileCopyrightText: 2022 Tobias Kaminsky <tobias@kaminsky.me>
	# SPDX-FileCopyrightText: 2022 Álvaro Brey <alvaro@alvarobrey.com>
	# SPDX-License-Identifier: GPL-3.0-or-later

	name: "Detect new java files"

	on:
	pull_request:
	branches: [ master, main, stable-* ]

	permissions: read-all

	concurrency:
	group: detect-new-java-files-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true

	jobs:
	detectNewJavaFiles:
	runs-on: ubuntu-latest
	steps:
	- id: file_changes
	uses: trilom/file-changes-action@a6ca26c14274c33b15e6499323aac178af06ad4b # v1.2.4
	with:
	output: ','
	- name: Detect new java files
	run: \|
	if [ -z '${{ steps.file_changes.outputs.files_added }}' ]; then
	echo "No new files added"
	exit 0
	fi
	new_java=$(echo '${{ steps.file_changes.outputs.files_added }}' \| tr ',' '\n' \| grep '\.java$' \| cat)
	if [ -n "$new_java" ]; then
	# shellcheck disable=SC2016
	printf 'New java files detected:\n```\n%s\n```\n' "$new_java" \| tee "$GITHUB_STEP_SUMMARY"
	exit 1
	else
	echo "No new java files detected"
	exit 0
	fi

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