Master 10 build stages

[grantmacken]

It is pull-request from master as requested by @duncdrum in #20

The Dockerfile can build images based on 2 build args.

1. VERSION: this is the eXist semver version. It can be stable or RC version
2. BRANCH: branch can be a
   • branch name e.g release, develop, xx-feature-branch
     • tagged commit e.g. eXist-4.3.1
     • any commit hash ( short or long ) e.g 3b19579, 3b195797a2c2f35913891412859b06d94f189229

NOTE: the docker build args VERSION, BUILD_DATE, VCS_REF are created via a dockerhub build hook hooks/build

Neither VERSION or BRANCH or required. If build-arg VERSION is empty, then the image is built from from the build-arg BUILD If build-arg BRANCH is empty then image defaults to the develop branch

This is a rework of the Dockerfile to build from openjdk-slim. It also tries to collapse the process logic in build.sh into the Dockerfile The only thing I had trouble with was copying over the webapp files I've commented out what I tried, and just copied over the whole webapp dir instead. I think I got it all, but there might be stuff I've missed

I created a config dir, moved known config files into it, and symlinked to back to origin. This allows the user to have a persistent docker volume consisting of eXist configuration files. See the docker-compose file for an example run-time declaration.

Dockerfile - modifications

• [x] start with openjdk-slim
• [x] VERSION build args derived from hooks/build
• [x] version ARG can be a stable or RC eXist release tag
• [x] its quicker to build if we don't use git but grab the release tar
• [x] use apt to get stuff for FOP
• [x] turn build.sh shell cmds process logic into a single RUN
• [x] move config files into config dir then symlink to origin
• [x] leave data dir in default position - it's a separate volume anyway
• [x] for customized config files use COPY not ADD
• [x] remove bin dir - distroless has no shell
• [x] remove tests dir - its already been tested
• [x] sort lists items for readability

docker-compose.yml - mods

• [x] add config volume

,env - addition

• [x] add env defaults for docker-compose

docker-compose.yml

• [x] 3 stages to build 3 images based on differing build-args
  • [x] make script commands succeed or fail, not just show.

Readme

• [x] add howto for config volume
• [x] removed docker copy ref

[grantmacken]

I'll have a crack, at branching in the dockerfile, after the weekend.

• test VERSION arg not empty - release tar
• grep BUILD arg commit SHA - clone check out
• test BUILD arg not empty - clone single branch
• default action BUILD arg develop

[adamretter]

It looks like this is missing some commits in comparison to https://github.com/eXist-db/docker-existdb/pull/22 ?

[grantmacken]

I am closing this, pull request. It is getting out of sync with the merged #22 and it actually extends code from that merge. I will raise a new issue, and create a branch from develop