Download php-fpm-exporter via Dockerfile

build.sh

@@ -5,7 +5,7 @@
 
 # Packages that are only used to build the container. These will be
 # removed once we're done.
-BUILD_PACKAGES="ca-certificates curl rsync"
+BUILD_PACKAGES="rsync"
 
 # Packages required to serve the website and run the services.
 # We have to keep the python3 packages around in order to run
@@ -34,9 +34,7 @@ set -e
 apt-get -q update
 install_packages ${BUILD_PACKAGES} ${PACKAGES}
 
-# Install the php-fpm prometheus exporter binary (no package yet).
-curl -sL -o /usr/sbin/php-fpm-exporter \
-     https://github.com/hipages/php-fpm_exporter/releases/download/v2.0.3/php-fpm_exporter_2.0.3_linux_amd64
+# Fix permissions on the php-fpm-exporter (installed via Dockerfile).
 chmod 0755 /usr/sbin/php-fpm-exporter
 
 # Set the PHP_FPM_EXPORTER_PORT in envvars, so that it is later picked up by