feat: ICU Support

[c-thiel]

@brianheineman I have one more (and believe last) feature I am missing: Support for ICU.
We are using case insensitive collations defined as:

    CREATE COLLATION case_insensitive (
      provider = icu,
      locale = 'und-u-ks-level2',
      deterministic = false
    )

Which currently raises:

Error: DriverError(IoError(error returned from database: ICU is not supported in this build

Caused by:
   ICU is not supported in this build

Would it be possible to add ICU-support for the binaries?

[c-thiel]

I see it is explicitly disabled here:

postgresql-binaries/dockerfiles/Dockerfile.linux-gnu

Line 60 in d4c483a

--without-icu \

[brianheineman]

Hello @c-thiel, thank you for the request. The ICU API appears to be versioned such that creating a build for one version (7.2) will be incompatible with another (7.4). In order to add ICU support to all the builds, there is some additional work that needs to be done to postgresql_embedded to detect the type/version of a linux distribution so that the appropriate binary could be pulled from this repository. This repository would then need to be updated to support the main distributions/versions. I think this would be the least disruptive way to add ICU support for all users. I think this would be a useful feature to add but I cannot commit to if/when I will have the time to look into it.

[c-thiel]

Thank you @brianheineman for trying - I appreciate the effort!