Add PHP 8.0 Dockerfile (#48)

* Add PHP 8.0 Dockerfile
* Build in PHP 8 as well

Author: carestad

.travis.yml

@@ -11,6 +11,7 @@ env:
     - PHP_VERSION=72
     - PHP_VERSION=73
     - PHP_VERSION=74
+    - PHP_VERSION=80
 
 # Installing a newer Docker version
 before_install:

Dockerfile-80

@@ -0,0 +1,51 @@
+#
+#--------------------------------------------------------------------------
+# Image Setup
+#--------------------------------------------------------------------------
+#
+
+FROM php:8.0-fpm
+
+# Set Environment Variables
+ENV DEBIAN_FRONTEND noninteractive
+
+#
+#--------------------------------------------------------------------------
+# Software's Installation
+#--------------------------------------------------------------------------
+#
+# Installing tools and PHP extentions using "apt", "docker-php", "pecl",
+#
+
+# Install "curl", "libmemcached-dev", "libpq-dev", "libjpeg-dev",
+#         "libpng-dev", "libfreetype6-dev", "libssl-dev", "libmcrypt-dev",
+RUN set -eux; \
+    apt-get update; \
+    apt-get upgrade -y; \
+    apt-get install -y --no-install-recommends \
+            curl \
+            libmemcached-dev \
+            libz-dev \
+            libpq-dev \
+            libjpeg-dev \
+            libpng-dev \
+            libfreetype6-dev \
+            libssl-dev \
+            libwebp-dev \
+            libmcrypt-dev \
+            libonig-dev; \
+    rm -rf /var/lib/apt/lists/*
+
+RUN set -eux; \
+    # Install the PHP pdo_mysql extention
+    docker-php-ext-install pdo_mysql; \
+    # Install the PHP pdo_pgsql extention
+    docker-php-ext-install pdo_pgsql; \
+    # Install the PHP gd library
+    docker-php-ext-configure gd \
+            --prefix=/usr \
+            --with-jpeg \
+            --with-webp \
+            --with-freetype; \
+    docker-php-ext-install gd; \
+    php -r 'var_dump(gd_info());'