id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
855446829,MDExOlB1bGxSZXF1ZXN0NjEzMTc4OTY4,1296,Dockerfile: use Ubuntu 20.10 as base,82332573,open,0,,,4,2021-04-12T00:23:32Z,2021-07-20T08:52:13Z,,FIRST_TIME_CONTRIBUTOR,simonw/datasette/pulls/1296,"This PR changes the main Dockerfile to use ubuntu:20.10 as base image instead of python:3.9.2-slim-buster (itself based on debian:buster-slim).

The Dockerfile is essentially the one from https://github.com/simonw/datasette/issues/1249#issuecomment-803698983 with some additional cleanups to slim it down.

This fixes a couple of issues:
1. The SQLite version in Debian Buster (2.6.0) doesn't support generated columns
2. Installing SpatiaLite from the Debian sid repositories has the side effect of also installing updates to libc and libstdc++ from sid.

As a bonus, the Docker image becomes smaller:


```
$ docker image ls
REPOSITORY                   TAG           IMAGE ID       CREATED       SIZE
datasette                    0.56-ubuntu   f7aca255140a   5 hours ago   212MB
datasetteproject/datasette   0.56          efb3b282f390   13 days ago   258MB
```

### Reproduction of the first issue

```
$ curl -O https://latest.datasette.io/fixtures.db
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  260k    0  260k    0     0   489k      0 --:--:-- --:--:-- --:--:--  489k

$ docker run -v `pwd`:/mnt datasetteproject/datasette:0.56 datasette /mnt/fixtures.db
Traceback (most recent call last):
  File ""/usr/local/bin/datasette"", line 8, in <module>
    sys.exit(cli())
  File ""/usr/local/lib/python3.9/site-packages/click/core.py"", line 829, in __call__
    return self.main(*args, **kwargs)
  File ""/usr/local/lib/python3.9/site-packages/click/core.py"", line 782, in main
    rv = self.invoke(ctx)
  File ""/usr/local/lib/python3.9/site-packages/click/core.py"", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File ""/usr/local/lib/python3.9/site-packages/click/core.py"", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File ""/usr/local/lib/python3.9/site-packages/click/core.py"", line 610, in invoke
    return callback(*args, **kwargs)
  File ""/usr/local/lib/python3.9/site-packages/datasette/cli.py"", line 544, in serve
    asyncio.get_event_loop().run_until_complete(check_databases(ds))
  File ""/usr/local/lib/python3.9/asyncio/base_events.py"", line 642, in run_until_complete
    return future.result()
  File ""/usr/local/lib/python3.9/site-packages/datasette/cli.py"", line 584, in check_databases
    await database.execute_fn(check_connection)
  File ""/usr/local/lib/python3.9/site-packages/datasette/database.py"", line 155, in execute_fn
    return await asyncio.get_event_loop().run_in_executor(
  File ""/usr/local/lib/python3.9/concurrent/futures/thread.py"", line 52, in run
    result = self.fn(*self.args, **self.kwargs)
  File ""/usr/local/lib/python3.9/site-packages/datasette/database.py"", line 153, in in_thread
    return fn(conn)
  File ""/usr/local/lib/python3.9/site-packages/datasette/utils/__init__.py"", line 892, in check_connection
    for r in conn.execute(
sqlite3.DatabaseError: malformed database schema (generated_columns) - near ""AS"": syntax error
```

Here is the SQLite version:

```
$ docker run -v `pwd`:/mnt -it datasetteproject/datasette:0.56 /bin/bash
root@d9220d3b95dd:/# python3
Python 3.9.2 (default, Mar 27 2021, 02:50:26) 
[GCC 8.3.0] on linux
Type ""help"", ""copyright"", ""credits"" or ""license"" for more information.
>>> import sqlite3
>>> sqlite3.version
'2.6.0'
```

### Reproduction of the second issue

```
$ docker build . -t datasette --build-arg VERSION=0.55
[...snip...]
The following packages will be upgraded:
  libc-bin libc6 libstdc++6
[...snip...]
Unpacking libc6:amd64 (2.31-11) over (2.28-10) ...
[...snip...]
Unpacking libstdc++6:amd64 (10.2.1-6) over (8.3.0-6) ...
[...snip...]
```

Both libc and libstdc++ are backwards compatible, so the image still works, but it will result in a combination of libraries and Python versions that exists only in the Datasette image, so it's likely untested. In addition, since Debian sid is an always-changing rolling-release, the versions of libc, libstdc++, Spatialite, and their dependencies change frequently, so the library versions in the Datasette image will depend on the day when it was built.
",107914493,pull,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1296/reactions"", ""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",0,