RFR: Add Dockerfile, zero-dep reproducible builds

[Jorn Vernee]

On Wed, 21 Sep 2022 15:41:42 GMT, Gavin Ray <duke at openjdk.org> wrote:

>> As title says, adds a Dockerfile that will fetch all necessary deps and build `jextract` for you on Ubuntu 22.10
>> 
>> It would be nice if some official JDK organization could put this on their Dockerhub, so that users could just do:
>> 
>> 
>> $ docker run --rm -it openjdk/jextract:latest
>> 
>> 
>> I've pushed it to my personal Dockerhub, so if anyone would like to test it out, you can use the README directions but prepend `gavinray/` before the image name:
>> 
>> 
>> $ echo "struct Foo { int a; long b; }; int use_foo(struct Foo foo);" >> sample.h
>> 
>> $ docker run --rm -it -v ${PWD}:/tmp/jextract \
>>     gavinray/jextract:latest \
>>     -I /tmp/jextract \
>>     --source \
>>     -l libfoo \
>>     --output /tmp/jextract/generated \
>>     --target-package com.example \
>
> But you already have my OCA, since last year ;..;

@GavinRay97 I see you in the OCA signatories list with the graal project listed. I'm not sure why the bot isn't picking this up. I'll ask around.

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PR: https://git.openjdk.org/jextract/pull/74