Tag the correct gitpod docker image name

[ewels]

GitPod docker push on release was failing, as a copy+paste typo had tools instead of gitpod:

docker tag nfcore/gitpod:latest nfcore/tools:2.6
docker push nfcore/gitpod:2.6

Now fixed, should work next release 🤞🏻

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated

[ewels]

CI failures are because we hit the rate limit for installing nextflow (GitHub API).

Should hopefully work if re-triggered in an hour or so.

[codecov]

Codecov Report

Merging #1874 (8832904) into dev (d2f9ce7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1874   +/-   ##
=======================================
  Coverage   64.44%   64.44%           
=======================================
  Files          35       35           
  Lines        4180     4180           
=======================================
  Hits         2694     2694           
  Misses       1486     1486           

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