add source code version information to the docker images

[randomorder]

spawning from #103

would be nice to have a reference to the docker source files version in the final docker image for debugging purposes

[lpasquali]

Hello @zsarkad please read the related issue to understand the context and come back to me

[lpasquali]

Hello @zsarkad

• Please add an argument to the Dockerfile GIT_HASH
• Update README if needed with info on the new build arg
• check custom_build.sh script if is possible to add automatically a variable populated with branch name called DOCKER_REPO_BRANCH
• Update the builds on docker hub to make use of the build argument

Once changed Dockerfile and custom_build.sh please make a PR against geosolutions-it/docker-geoserver

[zsarkad]

changed Dockerfile, custom_build.sh and README accordingly
made PR request waiting for confirmation from @lpasquali

#109

[zsarkad]

uploaded docker image

https://hub.docker.com/r/geosolutionsit/geoserver/tags

[randomorder]

Test latest 2.19 series and 2.20 series as well

[zsarkad]

tested 2.19 and 2.20 series , GIT_HASH works well for all images.

As a last step we will be updating builds on the docker hub so asked @lpasquali to help me on this process

[zsarkad]

triggered and updated builds on the Docker hub

https://hub.docker.com/repository/registry-1.docker.io/geosolutionsit/geoserver/tags?page=1&ordering=last_updated