Run integration tests on Github Actions

tests/Dockerfile

@@ -1,9 +1,13 @@
 # This Dockerfile can be used to run unit tests.
 # This image is published on the Docker Hub: kanboard/tests:latest
-FROM debian:10-slim
+FROM ubuntu:20.04
+
+ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update -y -q && \
     apt-get install -y \
+        apache2 \
+        libapache2-mod-php \
         php-cli \
         php-mbstring \
         php-sqlite3 \
@@ -21,4 +25,5 @@ RUN apt-get update -y -q && \
         git \
         make \
         mariadb-client \
-        postgresql-client
+        postgresql-client \
+    a2enmod rewrite