Updating Dockerfile to use minicli images

Dockerfile

@@ -1,12 +1,11 @@
-FROM erikaheidi/minicli:php81
-
-# Get latest Composer
-COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
-
-# Checkout Dynacover
+FROM minicli/php81-dev:latest AS builder
+WORKDIR /home/minicli
 RUN git clone -b 1.0.1 --depth 1 https://github.com/erikaheidi/dynacover.git && \
     cd dynacover && \
     composer install --no-progress --no-dev --prefer-dist
 
-ENTRYPOINT [ "php81", "/dynacover/dynacover" ]
+FROM minicli/php81:latest
+COPY --from=builder /home/minicli/dynacover /home/minicli
+
+ENTRYPOINT [ "php81", "/home/minicli/dynacover" ]
 CMD ["cover", "update"]