bump relx to rc2

Support ENV var for mix in the bare compiler

None of the version checks are considered safe enough by mix
maintainers, and so the agreed upon mechanism is to just set this
environment variable, which will be supported implicitly by rebar3
versions that can handle it.

This lets build artifacts (aside from some priv/ issues with plugins) to
properly be located within their build folder rather than the deps
folder, as the --outdir switch would otherwise have done.

add --all option for release building in parallel

Add powershell script generation option for escriptize on windows; use for rebar3 itself

revert change to lock for regular git resource from PR #2239

Not all of the changes to the git resource were reverted when
the sparse checkout support was moved to a new resource,
git_subdir_resource. This fixes issues caused by these changes
that were accidentally left.

Name the app being escriptized

Fix tests in Windows; adjust absolute paths

up relx to latest 4.0.0 branch with script's dist args fix

Since the compiler refactor changed the order of steps and all hooks get
applied at once, knowing which app is being escriptized isn't really
obvious, particularly when many apps individually define their own 'main
app' and they get run at once.

This adds the name of the main app being run when escriptizing it to make
it clear what goes on, especially if there are failures.

This was reported in https://github.com/erlang/rebar3/pull/2211#issuecomment-615937628

Fixes #2273

Starting with OTP-22, Erlang started changing how volume names are handled in
windows: filename:join/1 drops drive letters, filename:split/2 and
file:absname/1 use c:/ as a form instead of c:\\

We adjust the file_utils and their tests accordingly.

Rebar3.14 has new tests that were not windows ready and those are fixed.

Relx has two failing tests that are not covered in this branch.

Tested in Windows 10 with Powershell.

change aws s3 command to use cp not sync which is for dirs

Another Compiler Refactor: Performance & Cleanup

upgrade relx to latest 4.0.0 branch

Reenable tls 1.3

This reverts commit b7cfa757dc.

We run the analysis for an extra_src_dir by making a fake app for it,
but send in the app alone for analysis.

In there, the DAG pruning routine looks at the DAG and files submitted
and goes "this right here is a project with 99% of its apps deleted". It
then tries to prune the whole DAG except for some test files. The code
"works" simply because there's a false-positive check that makes sure
the file is on disk before removing it for the DAG.

This ends up making extra runs where ~80% of the time is spent
double-checking the false positives for file deletions.

This commit fixes this by merging in all extra_src fake apps and making them
run in a single analysis phase, meaning we only pay the cost of the DAG
pruning once for the whole project, making it faster than any sparse
repo.

There's also a small patch needed for the root-level extra src dirs;
turns out that since the context-handling in the `rebar_compiler` uses a
map to store content, running single-pass analysis clobbered entries for
a given app if they had more than one extra_src_dir in there.

I also took the time to clean up the ordering of that file.

Into a standalone module where it can be reused for optimisation work
later on.

Cleans up some annoying broken abstraction.

Also fix erl_first_file artifact tracking, which will avoid seeking to
disk by finding the opts in the DAG

Revert "wip: rework rebar_prv_path to use app info"

This reverts commit f0c8c202af.

output checkouts compilation to _build/<profile>/checkouts/

sparse-git checkout dependencies

add macos and windows test runs to github workflow

checking epmd is started without a crash

Because the resource doesn't absolutely require using a sparse
checkout, it only matters that rebar3 knows the correct path of the
application, the resource is named git_subdir.

It has to be git specific because the reason this subdir support is
special is the need to keep the code checkout as a usable git clone
to run commands against. This means the resource can't just copy
the content of the subdirectory to the application out directory.