build: creates base image to speed up build times

docker/Dockerfile.base

@@ -0,0 +1,16 @@
+ARG FRANKENPHP_TAG
+
+FROM dunglas/frankenphp:${FRANKENPHP_TAG}
+
+ENV SERVER_NAME=":80"
+ENV CADDY_GLOBAL_OPTIONS="auto_https off"
+ENV APP_RUNTIME="Runtime\\FrankenPhpSymfony\\Runtime"
+
+RUN install-php-extensions \
+	pdo_mysql \
+	gd \
+	intl \
+	zip \
+	opcache && \
+    apt install -y wget && \
+    apt clean && apt autoremove