Implement loading secrets from files

docker-entrypoint.sh

@@ -69,4 +69,20 @@ if [ ! -z "${PMA_USER_CONFIG_BASE64}" ]; then
     echo "${PMA_USER_CONFIG_BASE64}" | base64 -d > /etc/phpmyadmin/config.user.inc.php
 fi
 
+function get_docker_secret() {
+    local env_var="${1}"
+    local env_var_file="${env_var}_FILE"
+
+    # Check if the variable with name $env_var_file (which is $PMA_PASSWORD_FILE for example)
+    # is not empty and export $PMA_PASSWORD as the password in the Docker secrets file
+
+    if [[ -n "${!env_var_file}" ]]; then
+        export "${env_var}"="$(cat "${!env_var_file}")"
+    fi
+}
+
+get_docker_secret PMA_PASSWORD
+get_docker_secret MYSQL_ROOT_PASSWORD
+get_docker_secret MYSQL_PASSWORD
+
 exec "$@"