Custom CI image

MERGE REQUEST

MR Guidelines

Overview

• Uses the newly created https://hub.docker.com/repository/docker/nebulouslabs/sia-ci image
• Prints out current datetime and go version

The image is really simple but speeds up the builds a bit. This is the entire image (as of this moment):

FROM golang:1.15
LABEL maintainer="NebulousLabs <devs@nebulous.tech>"

RUN apt-get update && \
    apt-get -y install python3-pip && \
    apt-get clean && \
    wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v1.30.0 && \
    pip3 install codespell

There are some pipelines already run with it, including https://gitlab.com/NebulousLabs/Sia/-/jobs/714435565.

Example for Visual Changes

Checklist

Review and complete the checklist to ensure that the MR is complete before assigned to an approver.

• All new methods or updated methods have clear docstrings
• Testing added or updated for new methods
• Any new packages are added to Makefile and .gitlab-ci.yml
• API documentation updated for API updates
• Module README.md updated for changes to workflow
• Issue added to Sia-UI repo for new supporting features
• Changelog File Created

Issues Closed

Closes #3768 (closed)