diff --git a/.dockerignore b/.dockerignore
index b3dce7882d..6d40eb7d2b 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -5,6 +5,9 @@ packages/**/node_modules
 packages/app/out
 packages/app/.next
 .github
+.git
+.vscode
+docs
 
 # Allowlist
 !packages/app/*.conf
diff --git a/Dockerfile b/Dockerfile
index 90a3d44bd5..67f47f3410 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -76,7 +76,7 @@ RUN yarn download \
 && yarn workspace @corona-dashboard/cli validate-last-values --fail-early \
 && yarn workspace @corona-dashboard/cms lokalize:export --dataset=$NEXT_PUBLIC_SANITY_DATASET \
 && yarn workspace @corona-dashboard/app build \
-&& mkdir /app/packages/app/public/images/choropleth \
+&& mkdir -p /app/packages/app/public/images/choropleth \
 && addgroup -g 1001 -S nodejs \
 && adduser -S nextjs -u 1001 \
 && chown -R nextjs:nodejs /app/packages/app/.next \
diff --git a/docs/developers.md b/docs/developers.md
index 26e6deda98..9a38c795d6 100644
--- a/docs/developers.md
+++ b/docs/developers.md
@@ -38,6 +38,25 @@ docker build \
 .
 ```
 
+Running:
+
+```sh
+docker run --init --publish 8080:8080 local-test
+```
+
+Debugging a running container:
+
+```sh
+# get the containerId first by running
+docker ps
+
+# then use the containerId to connect into it
+docker exec -ti <containerId> sh
+
+# you can now run certain commands to debug, to inspect file/dir sizes for example:
+du -h -d 1 | sort -n
+```
+
 ## Testing Windows screenreaders on Mac
 
 To properly test accessibility on Mac, screenreaders for Windows should be