Resolve "Integration of single sign-on into oas"

Closes #439

See merge request openappstack/openappstack!183

Resolve "Create custom perststant volume for nextcloud and onlyoffice"

Closes #434

See merge request openappstack/openappstack!181

Resolve "Freeze all dependencies versions for beta test"

Closes #451

See merge request openappstack/openappstack!197

Resolve "Update install instructions"

Closes #312

See merge request openappstack/openappstack!195

change cert-manager namespace to oas namespace

See merge request openappstack/openappstack!200

Resolve "Include command line tests in testing instructions"

Closes #455

See merge request openappstack/openappstack!196

Resolve "Make rocketchat test deployment"

Closes #166

See merge request openappstack/openappstack!166

Closes: #451

Resolve "Backup and restore instructions"

Closes #152

See merge request openappstack/openappstack!194

Resolve "Let users test their cluster easily"

Closes #441

See merge request openappstack/openappstack!191

Closes: #312

Closes: #152