feat(scripts): introduce manual push script

This way, we can send some closures if some of our members build them on
more powerful machines.

Signed-off-by: Ryan Lahfa <ryan@dgnum.eu>

scripts/push-to-cache.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+shopt -s lastpipe
+
+output_path="$1"
+
+if [ "$STORE_ENDPOINT" == "" ]; then
+  echo "No endpoint given for the remote cache, uploading cannot take place."
+  exit 0
+fi
+
+if [ "$STORE_USER" == "" ]; then
+  echo "No user given for the remote cache, uploading cannot take place."
+  exit 0
+fi
+
+if [ "$STORE_PASSWORD" == "" ]; then
+  echo "No password given for the remote cache, uploading cannot take place."
+  exit 1
+fi
+
+cat <<EOF >.netrc
+default
+login $STORE_USER
+password $STORE_PASSWORD
+EOF
+
+nix copy \
+  --extra-experimental-features nix-command \
+  --to "$STORE_ENDPOINT?compression=none" \
+  --netrc-file .netrc \
+  "$output_path"
+
+rm .netrc