[openstreetmap/openstreetmap-website] Docker: clear out apt repo after installing packages (PR #6464)

[Pablo Brasero]

pablobm left a comment (openstreetmap/openstreetmap-website#6464)

Weirdly, when I tried there appeared to be less space available when deleting the lists than when not. I'm guessing it was a fluke as a result of... something container image volume something. No idea.

Before removal:
```
# du -sh /var/lib/apt/lists/
19M	/var/lib/apt/lists/

# df -h /
Filesystem      Size  Used Avail Use% Mounted on
overlay         220G  121G   89G  58% /
```
After removal:
```
# df -h /
Filesystem      Size  Used Avail Use% Mounted on
overlay         220G  123G   87G  59% /
```

But APT works. It just needs running `apt update` and then you can install packages again. So I added the line.

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