1.2.0

CHANGES:

• Upgrade OCaml from 4.12.1 to 4.14.0
• Desktop testing for Linux works with plain MSYS2 on Windows (using docker)
• Fix bug on GitLab CI where MSYS2 calling into cmd.exe could leave the
  GitLab CI session as Command Prompt rather than the usual PowerShell.

1.1.0

CHANGES:

New Features:

• Desktop testing for macOS/Intel (or macOS/ARM64 with Rosetta emulator) and Linux 32/64-bit on Intel/AMD
• Help messages for desktop testing on Windows
• Optional secondary switch two in addition to primary switch dkml enabled with
  input variable SECONDARY_SWITCH=true

Breaking changes:

• The GitLab job names build_linux, build_macos and build_win32 are now private job names .linux:setup-dkml,
  .macos:setup-dkml and .win32:setup-dkml. This means in your own .gitlab-ci.yml you will need an "extends" statement,
  like so:

  build_linux:
    extends: .linux:setup-dkml # ADD THIS ONE LINE!
    script:
      - opamrun exec -- echo Build me some Linux stuff

  Why break the API?

  This change was done so you could do incremental staged builds where job A does only the setup (which caches the OCaml
  compiler) and where the second job B does both the setup and the full build of your OCaml code. By using a private job
  name that starts with a dot (.) like .linux:setup-dkml, both job A and job B can extend from .**OS**:setup-dkml to
  share the setting up of the OCaml compiler cache.

  The benefit you get for the extra complexity is that you are more likely to stay under GitLab runner
  time limits; the shared SaaS GitLab runners time out jobs at 2 hours.
  For example Job A can take one hour or more for Windows when you enable SECONDARY_SWITCH=true.

  Hypothetically you could do a full build of your code without the caching of the OCaml compiler that took 2.5 hours.
  GitLab would fail your full build with time limit failures. But by splitting job A from job B, job A takes 1-1.5 hours
  while job B would only take 1.5 hours plus a few minutes for reading the cache of job A. Now both job A and job B
  can work without running into time limits.

  Why is it a minor break?

  Since there was no announcement of the previous 1.0.0 version, it is unlikely anyone is broken. And if
  anyone is broken, they just need to add three extends: .setup_dkml_XXX to their script.

Other changes:

• Performance: Linux CI now avoids ~10 second ManyLinux (dockcross) unnecessary recursive chown of root:root
  owned container files. As long as calling user is root (which is true for GitHub Actions and GitLab CI/CD)
  the chown operation is skipped.
• Remove unused gl_tags matrix variable

1.0.0

CHANGES:

New Features:

1. Support GitLab CI/CD
2. Support desktop testing on Windows
3. GitHub now uses a composite action rather than a child
   workflow, resulting in less artifact copying and
   quicker builds.

There are significant breaking changes. It will be far easier
to onboard with the new version v1 instructions
and then remove your v0 code, rather than try to do an in-place upgrade:

• Any custom build logic you have in your GitHub workflow should go into
  the new ci/build-test.sh. Alternatively, if you don't care about ever running troubleshooting
  CI on your desktop or GitLab, directly into your new .github/workflows/build-with-dkml.yml.

Breaking changes:

• The GitHub child workflow has been replaced by a GitHub composite action

• Input variables have been renamed to allow the same variable names between GitHub Actions and
  GitLab CI/CD (the latter does not support dashes in variable names).

  Old Name	New Name
  cache-prefix	CACHE_PREFIX
  ocaml-compiler	OCAML_COMPILER
  dkml-compiler	DKML_COMPILER
  conf-dkml-cross-toolchain	CONF_DKML_CROSS_TOOLCHAIN
  diskuv-opam-repository	DISKUV_OPAM_REPOSITORY
  ocaml-options	ocaml_options
  vsstudio-arch	vsstudio_arch
  vsstudio-hostarch	vsstudio_hostarch
  vsstudio-dir	vsstudio_dir
  vsstudio-vcvarsver	vsstudio_vcvarsver
  vsstudio-winsdkver	vsstudio_winsdkver
  vsstudio-msvspreference	vsstudio_msvspreference
  vsstudio-cmakegenerator	vsstudio_cmakegenerator

• Matrix variables have been renamed to allow the same variable names between GitHub Actions and
  GitLab CI/CD (the latter does not support dashes in variable names).

• The shell matrix variable default_shell has been renamed gh_unix_shell

• The operating system matrix variable has been reorganized to distingush GitHub
  from GitLab:

  • os is now gh_os and in use only for GitHub Actions
  • gl_tags and gl_image are the new GitLab CI/CD equivalents. GitLab CI/CD uses tags like
    [shared-windows, windows, windows-1809] to specify the type of runner machine to use,
    and for macOS image you can supply an XCode version like macos-11-xcode-12.

1.0.0-r1

Add scaffolding; improve docs