Dockerize passman for modern environments

Ported the original passman PHP/MySQL application to a Docker-based setup using Apache and MariaDB.
Fixed compatibility issues with modern PHP/MariaDB versions (HTTP header handling and database collation) using minimal, targeted changes.
Preserved the original application logic and structure while ensuring correct execution in a contemporary containerized environment.

passman-dev/Dockerfile

@@ -0,0 +1,10 @@
+FROM php:8.2-apache
+
+# Install mysqli extension (needed for mysqli_connect)
+RUN docker-php-ext-install mysqli
+
+# Optional: enable rewrite
+RUN a2enmod rewrite
+
+# Keep default docroot: /var/www/html
+WORKDIR /var/www/html