Replace COPY with bind mount in default modules example

Author: jnoordsij

modules/Dockerfile

@@ -70,12 +70,11 @@ RUN set -ex \
     && echo "BUILT_MODULES=\"$BUILT_MODULES\"" > /tmp/packages/modules.env
 
 FROM ${NGINX_FROM_IMAGE}
-COPY --from=builder /tmp/packages /tmp/packages
-RUN set -ex \
+RUN --mount=type=bind,target=/tmp/packages/,source=/tmp/packages/,from=builder \
+    set -ex \
     && apt update \
     && . /tmp/packages/modules.env \
     && for module in $BUILT_MODULES; do \
            apt install --no-install-suggests --no-install-recommends -y /tmp/packages/nginx-module-${module}_${NGINX_VERSION}*.deb; \
        done \
-    && rm -rf /tmp/packages \
     && rm -rf /var/lib/apt/lists/