fix: Add missing functions.sh

Signed-off-by: Julius Härtl <jus@bitgrid.net>

scripts/functions.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+function get_docker_compose_command() {
+    docker-compose version >/dev/null 2>/dev/null && DCC='docker-compose'
+    docker compose version >/dev/null 2>/dev/null && DCC='docker compose'
+    if [ -z "$DCC" ]; then
+        return
+    fi
+    echo "$DCC"
+}
+
+function docker_compose() {
+    DCC=$(get_docker_compose_command)
+    if [ -z "$DCC" ]; then
+        echo "❌ Install docker-compose before running this script"
+        exit 1
+    fi
+    $DCC "$@"
+}