+ small changes in readme

Fix HTTP checksum to deal with weak ETags

See merge request !39

Web servers can mark ETag as weak by adding the prefix 'W/'. To be
consistent, Kadeploy must not include this prefix in its checksum.
See: https://intranet.grid5000.fr/bugzilla/show_bug.cgi?id=15184

Make sure takargs is not nil

See merge request !38

[vagrant] do not set the serial console in miniOS, so that the interactive console goes to the vagrant screen

Useful for instance if enabling an initramfs breakpoint (e.g. add
`break=premount` in the kernel cmdline)

Another option is to enable kaconsole in the vagrant env, e.g. by
configuring nodes to expose the virtual serial ports on TCP ports
(supported by virtualbox) than configuring the cluster to use them with
netcat.

Reported error:
    kadeploy: + gem install --conservative --no-ri --no-rdoc mysql2
    kadeploy: Building native extensions. This could take a while...
    kadeploy: ERROR:  Error installing mysql2:
    kadeploy:     ERROR: Failed to build gem native extension.
    kadeploy:
kadeploy:     current directory:
/var/lib/gems/2.5.0/gems/mysql2-0.5.5/ext/mysql2
kadeploy: /usr/bin/ruby2.5 -r ./siteconf20230615-12767-qbk791.rb
extconf.rb
kadeploy: Cannot allocate memory - /usr/bin/ruby2.5 -r
./siteconf20230615-12767-qbk791.rb extconf.rb 2>&1
    kadeploy:
kadeploy: Gem files will remain installed in
/var/lib/gems/2.5.0/gems/mysql2-0.5.5 for inspection.
kadeploy: Results logged to
/var/lib/gems/2.5.0/extensions/x86_64-linux/2.5.0/mysql2-0.5.5/gem_make.out
The SSH command responded with a non-zero exit status. Vagrant
assumes that this means the command failed. The output for this command
should be in the log above. Please read the output to determine what
went wrong.

fixed address host config should not be within a sub scope.

On some systems, the default provider might not be virtualbox. Enforces
it.

This reverts commit 7135e68d.

API: do not consume log/debug when making a get on /deployment/[ID]/{logs,debugs}   #13867

See merge request !36

cf 13867.

Move rubocop stage to grid5000-gitlab-templates

See merge request !35

[kaworkflow] fallback to default arch of the first node when using api and no arch specified

See merge request !34

Rename deploymentEnv in deploymentMiniOS

See merge request !33

Some configuration changed must be made with this version:
- in kadeploy server conf: test_deploy_env  -> test_deployment_mini_os
- in cluster congiguration: step called SetDeploymentEnv are now called SetDeploymentMiniOS
Using kareboot using the old way (-r deploy_env) is still supported

add startup script step

See merge request !32