No .next directory after Docker build in GitHub Actions

TLDR; Version

Could be your node version if you using a alpine version.

When I posted my latest post here I got some super weird behavior. Everything seems to work and build as normal. But couldn't reach the site.

When I did a docker logs jarnesjo.com on the container I saw the following error message.

Error: Could not find a production build in the '/opt/app/.next' directory. Try building your app with 'next build' before starting the production server.

Ok so I did restart of the container and check whats init before it got killed and did saw the .next directory in there. Super weird!

The build works and could be started locally but something is going wrong in GitHub Actions. So it kind a hard to debug if you have to deploy and wait for the build steps to go through and don't see any obvious errors.

After hours of debugging I took a look into the .next directory in the deployed and failed container and found following

➜  ~ docker exec jarnesjo.com ls -lart ./.next

total 16
-rw-r--r--    1 nextjs   nodejs         662 Nov 19 13:03 routes-manifest.json
drwxr-xr-x    3 nextjs   nodejs        4096 Nov 19 13:03 cache
drwxr-xr-x    3 nextjs   nodejs        4096 Nov 19 13:03 .
drwxr-xr-x    1 root     root          4096 Nov 19 13:03 ..

Took a look into my local build to see how it should look like

➜  ~ docker exec jarnesjo.com ls -lart ./.next

total 60
drwxr-xr-x 4 root root 4096 Nov 19 13:56 server
drwxr-xr-x 6 root root 4096 Nov 19 13:57 static
-rw-r--r-- 1 root root    2 Nov 19 13:57 react-loadable-manifest.json
-rw-r--r-- 1 root root 4008 Nov 19 13:57 build-manifest.json
-rw-r--r-- 1 root root 1278 Nov 19 13:57 routes-manifest.json
-rw-r--r-- 1 root root 1358 Nov 19 13:57 required-server-files.json
-rw-r--r-- 1 root root   21 Nov 19 13:57 BUILD_ID
-rw-r--r-- 1 root root 3499 Nov 19 13:57 prerender-manifest.json
-rw-r--r-- 1 root root  262 Nov 19 13:57 images-manifest.json
-rw-r--r-- 1 root root   93 Nov 19 13:57 export-marker.json
drwxr-xr-x 1 root root 4096 Nov 19 13:57 .
drwxr-xr-x 1 root root 4096 Nov 19 13:57 ..
drwxr-xr-x 1 root root 4096 Nov 19 14:00 cache

Something going very wrong here. Ok how to tackle it?
I started with notice I use node:lts-alpine. Ok so no hard version dependency so changed it to node:14-alpine instead but with the same result.

After many turns I finally stop worrying about a small build so changed to node:14 and after that everything worked as expected.

Super annoying debug that just popped up from nowhere but hope this can helps if you getting same error.