feat: initial commit — tcb_devportal Next.js app

Includes Helm chart (tcb-devportal), Jenkinsfile with homelab CI pipeline,
and Next.js app source.

docker-entrypoint.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+set -e
+
+echo "🔧 Generating runtime env config..."
+
+ENV_FILE="/app/public/env.js"
+
+cat <<EOF > $ENV_FILE
+window.__ENV__ = {
+  NEXT_PUBLIC_ENVIRONMENT: "${NEXT_PUBLIC_ENVIRONMENT}",
+  NEXT_PUBLIC_BACK_END_DOMAIN: "${NEXT_PUBLIC_BACK_END_DOMAIN}",
+  NEXT_PUBLIC_TIME_OUT_API: "${NEXT_PUBLIC_TIME_OUT_API}",
+  NEXT_PUBLIC_RECAPTCHA_SITE_KEY: "${NEXT_PUBLIC_RECAPTCHA_SITE_KEY}"
+};
+EOF
+
+echo "✅ Generated $ENV_FILE:"
+cat $ENV_FILE
+
+echo "🚀 Starting Next.js..."
+exec "$@"
+