feat: FRO-28 Integrate Frontend Build as a seperate image (#2)

Reviewed-on: #2
Co-authored-by: Janis <janis.e.20@gmx.de>
Co-committed-by: Janis <janis.e.20@gmx.de>

docker-entrypoint.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+set -e
+
+# Replace placeholders in env.template.js with environment variables and write env.js
+TEMPLATE_PATH="/usr/share/nginx/html/env.template.js"
+TARGET_PATH="/usr/share/nginx/html/env.js"
+
+if [ -f "$TEMPLATE_PATH" ]; then
+  echo "Rendering runtime config from $TEMPLATE_PATH"
+  # export all variables for envsubst to access
+  # only substitute variables present in the template
+  envsubst < "$TEMPLATE_PATH" > "$TARGET_PATH"
+else
+  echo "No runtime template found at $TEMPLATE_PATH, skipping"
+fi
+
+# Start nginx in foreground
+exec nginx -g 'daemon off;'
+