Extracted install script into bash script

.github/actions/run-tests/tests/Dockerfile

@@ -2,19 +2,8 @@
 ARG PHPVERSION
 FROM php:${PHPVERSION}-cli
 
-RUN apt-get update && \
+COPY install.sh /install.sh
-	apt-get install -y --no-install-recommends npm make default-mysql-client postgresql-client \
+RUN /install.sh
-		unzip git libfreetype6-dev libpng-dev libjpeg-dev libzip-dev cmake libpq-dev libsqlite3-dev && \
-	if [ ${PHPVERSION} = "7.2" ]; then \
-		docker-php-ext-configure gd; \
-	else \
-		docker-php-ext-configure gd --with-freetype --with-jpeg; \
-	fi && \
-	docker-php-ext-install -j $(nproc) gd && \
-	docker-php-ext-configure zip && \
-	docker-php-ext-install -j$(nproc) zip && \
-	docker-php-ext-install -j$(nproc) pdo pdo_mysql pdo_pgsql pdo_sqlite && \
-	apt-get clean
 
 RUN mkdir /workdir
 WORKDIR /workdir

.github/actions/run-tests/tests/install.sh

@@ -0,0 +1,41 @@
+#!/bin/bash -e
+
+set -x
+
+function configure_gd_normal ()
+{
+	docker-php-ext-configure gd --with-freetype --with-jpeg
+	return $?
+}
+
+function configure_gd_without ()
+{
+	docker-php-ext-configure gd
+	return $?
+}
+
+function configure_gd()
+{
+	if [ "$1" = "7.2" ]; then
+		configure_gd_without
+		return $?
+	else
+		configure_gd_normal
+		return $?
+	fi
+}
+
+
+apt-get update
+apt-get install -y --no-install-recommends \
+	npm make default-mysql-client postgresql-client \
+	unzip git libfreetype6-dev libpng-dev libjpeg-dev libzip-dev cmake libpq-dev libsqlite3-dev
+apt-get clean
+
+configure_gd "$1"
+docker-php-ext-install -j$(nproc) gd
+
+docker-php-ext-configure zip
+docker-php-ext-install -j$(nproc) zip
+
+docker-php-ext-install -j$(nproc) pdo pdo_mysql pdo_pgsql pdo_sqlite