allow to run this behind a reverse proxy

Signed-off-by: szaimen <szaimen@e.mail.de>

Containers/mastercontainer/start.sh

@@ -6,6 +6,14 @@ print_green() {
     printf "%b%s%b\n" "\e[0;92m" "$TEXT" "\e[0m"
 }
 
+# Function to check if number was provided
+check_if_number() {
+case "${1}" in
+    ''|*[!0-9]*) return 1 ;;
+    *) return 0 ;;
+esac
+}
+
 # Check if socket is available and readable
 if ! [ -a "/var/run/docker.sock" ]; then
     echo "Docker socket is not available. Cannot continue."
@@ -68,6 +76,15 @@ The string must be equal to/start with '/mnt/' or '/media/' or be equal to '/var
         exit 1
     fi
 fi
+if [ -n "$APACHE_PORT" ]; then
+    if ! check_if_number "$APACHE_PORT"; then
+        echo "You provided an Apache port but did not only use numbers"
+        exit 1
+    elif ! [ "$APACHE_PORT" -le 65535 ] || ! [ "$APACHE_PORT" -ge 1 ]; then
+        echo "The provided Apache port is invalid. It must be between 1 and 65535"
+        exit 1
+    fi
+fi
 
 # Add important folders
 mkdir -p /mnt/docker-aio-config/data/