updated Dockerfile

Dockerfile

@@ -1,9 +1,12 @@
-FROM alpine:3.14
+ARG ALPINE_VERSION=3.14
+FROM alpine:${ALPINE_VERSION}
 LABEL Maintainer="Tim de Pater <code@trafex.nl>"
 LABEL Description="Lightweight container with Nginx 1.20 & PHP 8.0 based on Alpine Linux."
+# Setup document root
+WORKDIR /var/www/html
 
 # Install packages and remove default server definition
-RUN apk --no-cache add \
+RUN apk add --no-cache --update \
   curl \
   nginx \
   php8 \
@@ -22,8 +25,7 @@ RUN apk --no-cache add \
   php8-session \
   php8-xml \
   php8-xmlreader \
-  php8-zlib \
-  supervisor
+  php8-zlib
 
 # Create symlink so programs depending on `php` still function
 RUN ln -s /usr/bin/php8 /usr/bin/php
@@ -35,23 +37,17 @@ COPY config/nginx.conf /etc/nginx/nginx.conf
 COPY config/fpm-pool.conf /etc/php8/php-fpm.d/www.conf
 COPY config/php.ini /etc/php8/conf.d/custom.ini
 
-# Configure supervisord
+# Install a golang port of supervisord and Configure
+COPY --from=ochinchina/supervisord:latest /usr/local/bin/supervisord /usr/bin/supervisord
 COPY config/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
 
-# Setup document root
-RUN mkdir -p /var/www/html
-
 # Make sure files/folders needed by the processes are accessable when they run under the nobody user
-RUN chown -R nobody.nobody /var/www/html && \
-  chown -R nobody.nobody /run && \
-  chown -R nobody.nobody /var/lib/nginx && \
-  chown -R nobody.nobody /var/log/nginx
+RUN chown -R nobody.nobody /var/www/html /run /var/lib/nginx /var/log/nginx
 
 # Switch to use a non-root user from here on
 USER nobody
 
 # Add application
-WORKDIR /var/www/html
 COPY --chown=nobody src/ /var/www/html/
 
 # Expose the port nginx is reachable on