decidim: mirror koopa-decidim setup (9027, docs for /sm showcase)

configs/decidim/entrypoint.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+# Wait for Postgres, migrate, then exec CMD (rails or sidekiq).
+set -euo pipefail
+
+export RAILS_ENV="${RAILS_ENV:-production}"
+
+echo "koopa-decidim: waiting for postgres..."
+i=0
+until bundle exec rails runner 'ActiveRecord::Base.connection.execute("SELECT 1")' >/dev/null 2>&1; do
+  i=$((i + 1))
+  if [ "$i" -ge 60 ]; then
+    echo "koopa-decidim: postgres not ready after ${i} tries" >&2
+    exit 1
+  fi
+  sleep 3
+done
+
+echo "koopa-decidim: db:prepare"
+bundle exec rails db:prepare
+
+echo "koopa-decidim: exec $*"
+exec "$@"