diff --git a/.gitignore b/.gitignore
index b512c09..ba81622 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
-node_modules
\ No newline at end of file
+node_modules
+.env
+build
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 316191b..2d81464 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,4 +16,4 @@ COPY --from=build-env /app/build /app/build
 COPY --from=build-env /app/public /app/public
 WORKDIR /app
 # there is a DOMAINS env with comma separated allowed domains for image processing
-CMD ["npm", "run", "start"]
+CMD ["PORT=4000", "npm", "run", "start"]