Update 'Dockerfile'

Dockerfile

@@ -3,32 +3,27 @@ FROM mcr.microsoft.com/powershell:ubuntu-bionic
 COPY init/entrypoint.sh /usr/local/bin
 
 RUN chmod +x /usr/local/bin/entrypoint.sh && \
-    apt update && \
+    apt-get update && \
-    apt install \
+    apt-get install \
+      software-properties-common && \
+    add-apt-repository ppa:ondrej/php && \
+    apt-get install -y \
       lighttpd \
       fcgi \
-      php7-cgi \
+      php7.3-cgi \
-      php7-common \
+      php7.3-common \
-#      php7-ctype \
+      php7.3-curl \
-      php7-curl \
+      php7.3-gd \
-#      php7-dom \
+      php7.3-json \
-      php7-gd \
+      php7.3-ldap \
-#      php7-gettext \
+      php7.3-pdo \
-#      php7-iconv \
+      php7.3-pdo_sqlite \
-#      php7-imap \
+      php7.3-session \
-      php7-json \
+      php7.3-xmlrpc && \
-      php7-ldap \
-#      php7-mcrypt \
-#      php7-mysqli \
-      php7-pdo \
-#      php7-pdo_mysql \
-      php7-pdo_sqlite \
-#      php7-posix \
-      php7-session \
-#      php7-soap \
-#      php7-xml \
-      php7-xmlrpc && \
     rm -rf /var/lib/apt/lists/* && \
+    apt-get remove \
+      software-properties-common && \
+    apt-get autoremove -y && \
     # Enable PHP
     sed -i 's:#   include "mod_fastcgi.conf":   include "mod_fastcgi.conf":' /etc/lighttpd/lighttpd.conf && \
     sed -i 's:/usr/bin/php-cgi:/usr/bin/php-cgi7:' /etc/lighttpd/mod_fastcgi.conf && \