Update update-restic.sh to use a temporary directory for cloning and cleanup

- Modify the script to create a unique temporary directory for cloning the repository
- Change the script to remove the temporary directory after execution
- Ensure the repository is cloned into the temporary directory and cleaned up after the script is done running

update-restic.sh

@@ -18,9 +18,10 @@ if ! grep -q "^relayhost" $POSTFIX_CONFIG; then
   exit 1
 fi
 
-# Clone the repository
-git clone $GIT_REPO
-cd restic-docker
+# Create a temporary directory and clone the repository
+TEMP_DIR=$(mktemp -d)
+git clone $GIT_REPO $TEMP_DIR
+cd $TEMP_DIR
 
 # Get the latest version of Restic
 LATEST_VERSION=$(curl --silent "https://api.github.com/repos/restic/restic/releases/latest" | jq -r .tag_name | tr -d v)
@@ -46,3 +47,7 @@ if [ "$LATEST_VERSION" != "$CURRENT_VERSION" ]; then
 else
   echo "The Restic Docker image is already up to date (version $CURRENT_VERSION)."
 fi
+
+# Clean up the temporary directory
+cd ..
+rm -rf $TEMP_DIR