Improve the current pipeline

Goals

• Reliable and fast,
• A crucial indicator if a branch can be merged,
• Run linters, unit, integration and e2e tests depending on a context.

Details

• Overview described in https://www.notion.so/status/CI-Pipeline-Travis-CI-1051abce9a044555b0befd81ab2ab1f9
• Issue https://github.com/status-im/status-go/issues/284

Discussion