Setup GitHub Actions

tests/Dockerfile

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+# This Dockerfile can be used to run unit tests.
+# This image is published on the Docker Hub: kanboard/tests:latest
+FROM debian:10-slim
+
+RUN apt-get update -y -q && \
+    apt-get install -y \
+        php-cli \
+        php-mbstring \
+        php-sqlite3 \
+        php-opcache \
+        php-json \
+        php-ldap \
+        php-gd \
+        php-zip \
+        php-curl \
+        php-xml \
+        php-mysql \
+        php-pgsql \
+        composer \
+        npm \
+        git \
+        make \
+        mariadb-client \
+        postgresql-client