nit README formatting

Signed-off-by: Taylor Silva <[email protected]>

document sparse_paths in README

Signed-off-by: Taylor Silva <[email protected]>

fix private keys being added to final image from openssh package

The openssh package generates some private keys upon installation.
Switched to the client package instead; we don't need the server
component anyways.

Hadd to add a line to ensure ssh-keygen was installed for the tests.

Signed-off-by: Taylor Silva <[email protected]>

Merge pull request #436 from concourse/hide-extra-boolean-output

Hide output from `jq -e` statements

Merge pull request #433 from mstandley-tempus/handle-non-initial-comm…

…its-without-parents

handle non-initial orphan commits as current resource version

remove debugging "set -x"

Signed-off-by: Taylor Silva <[email protected]>

nit: typo

Closes #431

Signed-off-by: Taylor Silva <[email protected]>

Merge pull request #391 from britto/add-git-branch-file

Populate additional `.git/branch` file

Merge pull request #388 from jpmorin/submodule-ssh-support

SSH support for submodule

remove alpine dockerfile

Signed-off-by: Rui Yang <[email protected]>