[nix] Run set-up-authoritative-keyserver.sh on nix startup

Summary:
issue: [[https://linear.app/comm/issue/ENG-6845/multi-keyserver-testing-pt-2 | ENG-6845]]
We want to run set-up-authoritative-keyserver.sh when nix is run.

Test Plan: Ran `nix develop` and checked that the script is executed

Reviewers: michal, tomek, O1 Nix

Reviewed By: michal

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D11310

nix/dev-shell.nix

@@ -154,6 +154,8 @@ mkShell {
     # Provide decent bash prompt
     source "${better-prompt}/bin/better-prompt"
 
+    $PRJ_ROOT/scripts/set-up-authoritative-keyserver.sh
+
     echo "Welcome to Comm dev environment! :)"
   '';
 }

scripts/set-up-authoritative-keyserver.sh

@@ -5,7 +5,7 @@ PRJ_ROOT="$(git rev-parse --show-toplevel)"
 user_credentials_file="$PRJ_ROOT/keyserver/secrets/user_credentials.json"
 
 set_up_or_abort() {
-  read -r -p "Do you want to set up a new authoritative keyserver? (y/N) " user_input
+  read -t 60 -r -p "Do you want to set up a new authoritative keyserver? (y/N) " user_input
 
   if [[ $user_input != "Y" && $user_input != "y" ]]; then
     exit 1
@@ -35,6 +35,10 @@ set_up_or_abort() {
   node "$PRJ_ROOT"/scripts/set-user-credentials.js "$PRJ_ROOT"
 }
 
+if [[ -n "$BUILDKITE" || -n "$GITHUB_ACTIONS" ]]; then
+  exit
+fi
+
 if grep -q '"usingIdentityCredentials":.*true' "$user_credentials_file"; then    
   if ! (mysql -u "$USER" -Bse "USE comm; SELECT * FROM metadata" 2>/dev/null | grep "db_version">/dev/null); then
     echo -e "'usingIdentityCredentials' is set to true, but the database is not set up.\n" \