feat: flatpaksync module

modules/flatpak-sync/README.md

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+# `flatpaksync` Module for Startingpoint
+
+The `flatpaksync` module can be used to synchronize user-installed flatpaks into a gist.
+
+To activate it, simply follow the example below:
+
+## Example configuration
+
+```yaml
+- type: flatpaksync
+  enable: true
+```
+
+Once the module is activated, users can create a file `$HOME/.config/flatpaksync/env` informing the repository that will be used to synchronize their apps in the POSIX standard:
+
+```bash
+GIST_REPO=<YOUR_REPO>
+```
+
+If the user has not yet installed their flatpaks and has already done the step above, simply use the `flatpakcheckout` binary to perform the installation and start the synchronization.
+
+If the user has already configured their repository in the `$HOME/.config/flatpaksync/env` file but already has their flatpaks installed, simply create the `$HOME/.config/flatpaks.user.installed` file to start the synchronization.

modules/flatpak-sync/flatpak-sync.sh

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+#!/usr/bin/env bash
+set -oue pipefail
+
+export BLING_FILES_DIRECTORY="/tmp/bling/files"
+
+chmod +x "$BLING_FILES_DIRECTORY"/usr/bin/flatpaksync/*
+
+cp -r "$BLING_FILES_DIRECTORY"/usr/bin/flatpaksync/* /usr/bin/
+
+cp -r "$BLING_FILES_DIRECTORY"/usr/lib/systemd/user/flatpaksync.service /usr/lib/systemd/user/flatpaksync.service
+cp -r "$BLING_FILES_DIRECTORY"/usr/lib/systemd/user/flatpaksync.path /usr/lib/systemd/user/flatpaksync.path
+
+systemctl enable --global flatpaksync.path