Switch to duplicati/duplicati Docker image

init.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env sh
+
+# Define a helper function that runs a command
+# If the command fails, the script prints an error message
+# and exits immediately.
+run() {
+    # "$@" expands to all arguments passed to this function
+    # and preserves proper word splitting and quoting.
+    "$@" || {
+        echo "Error: command failed: $*" >&2
+        exit 1
+    }
+}
+
+# Make sure volumes have correct permissions
+run chown duplicati:duplicati /data
+run chown duplicati:duplicati /source
+