Add php 8.1 alpine version

src/docker/8.1/Dockerfile.alpine

@@ -0,0 +1,21 @@
+FROM php:8.1-fpm-alpine
+ARG WORKDIR=/var/www/html
+ENV DOCUMENT_ROOT=${WORKDIR}
+ENV LARAVEL_PROCS_NUMBER=1
+ARG HOST_UID=1000
+ENV USER=www-data
+
+# Install the PHP pdo_mysql extention
+RUN docker-php-ext-install pdo_mysql
+
+# Install Composer
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+
+# Set working directory
+WORKDIR $WORKDIR
+
+RUN rm -Rf /var/www/* && \
+mkdir -p /var/www/html
+
+ADD src/index.php $WORKDIR/index.php
+ADD src/php.ini $PHP_INI_DIR/conf.d/