fix docker image build during npm install (error with Nodejs 15+)

during image build, set a current directory with WORKDIR to prevent npm install from being executed in the root directory, resulting into a build error (that happens since Nodejs 15)

start s3rver with no-vhost-buckets option and update s3rver to 3.6.1 (minor update)

Merge pull request #15 from allan-simon/patch-3

add no-vhost-buckets

upgrade to s3rver 3.6.0 and allow extra parameters

• Upgraded to the latest version of s3rver
• Added an env variable to allow passing extra arguments
• Documented how to use the env variable to enable path-style behavior for the bucket using the newly added --no-vhost-buckets option: jamhall/s3rver#632 (main motivation for this)

s3rver major upgrade (3.5.0)

Merge pull request #12 from allan-simon/master

bumped s3rver version to 3.5.0

Integrate the MIT license

Merge pull request #10 from jean553/integrate_mit_license

integrate the MIT license

Major upgrade from s3rver version 1 to version 2

Merge pull request #6 from allanlegalstart/patch-1

Update dockerfile to latest version of s3server (2.2.8)

Tag for old version without upgrade of s3rver

0.5.0

Merge pull request #5 from jean553/add_note_in_readme_about_vagrant_i…