Install git and ssh before checking out code on CircleCI

[bouweandela]

Description

Closes #1600

I already uploaded a new docker container esmvalgroup/esmvalcore:development built from docker/Dockerfile.dev in this pull request. Tests in this branch and in #1554 are working as expected again with the new container.

---

Before you get started

• ☝ Create an issue to discuss what you are going to do

Checklist

It is the responsibility of the author to make sure the pull request is ready to review. The icons indicate whether the item will be subject to the 🛠 Technical or 🧪 Scientific review.

• 🧪 The new functionality is relevant and scientifically sound
• 🛠 This pull request has a descriptive title and labels
• 🛠 The list of authors is up to date
• 🛠 All checks below this pull request were successful

---

To help with the number pull requests:

• 🙏 We kindly ask you to review two other open pull requests in this repository

[codecov]

Codecov Report

Merging #1601 (e6683b2) into main (9486f47) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1601   +/-   ##
=======================================
  Coverage   90.99%   90.99%           
=======================================
  Files         201      201           
  Lines       10676    10676           
=======================================
  Hits         9715     9715           
  Misses        961      961           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9486f47...e6683b2. Read the comment docs.

[schlunma]

Tests are running again in #1554, thanks @bouweandela for the quick fix! 🎉

@valeriupredoi please merge if you are also fine with these changes.

[valeriupredoi]

good catch @bouweandela 🍺