Merge branch 'new-update-dockerfile' of github.com:radupopa2010/sub-flood into new-update-dockerfile

* Update docker file in accordance with gurke image

* update docker file

* Fix error in docker cache cleanup when 2 build jobs run in parallel

* Add gitlab file and runner

* add mandatory filed "script"

* add mandatory filed "script" v2

* add all stages to ci file

* add all stages to ci file

* Add all stages in ci file, v2

* Add gitlab file and runner

* add mandatory filed "script"

* Add command "sub-flood", install it golbally and add it to system path

* How to run the script from user independent path

* How to run the script from user independent path

* Update README.md

Bump version 3.6 for Polkadot API

Version 3.5.1 of Polkadot API bumped

Timeout for api request added

Updating flooding script for the usage in SimNet

Bump lodash from 4.17.15 to 4.17.19

Bump elliptic from 6.5.2 to 6.5.3

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.2 to 6.5.3.
- [Release notes](https://github.com/indutny/elliptic/releases)
- [Commits](https://github.com/indutny/elliptic/compare/v6.5.2...v6.5.3

)

Signed-off-by: dependabot[bot] <[email protected]>

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.19.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.15...4.17.19

)

Signed-off-by: dependabot[bot] <[email protected]>