Add website update to release process

[estesp]

Update release process with step to get downloads list updated on
containerd.io website

Signed-off-by: Phil Estes estesp@linux.vnet.ibm.com

[crosbymichael]

LGTM

We will have to figureout how to automate this in the future

[dmcgowan]

LGTM

[codecov-io]

Codecov Report

Merging #3021 into master will decrease coverage by 3.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3021      +/-   ##
==========================================
- Coverage   47.58%   43.96%   -3.62%     
==========================================
  Files          92      102      +10     
  Lines        8505    10881    +2376     
==========================================
+ Hits         4047     4784     +737     
- Misses       3731     5362    +1631     
- Partials      727      735       +8

Flag	Coverage Δ
#linux	47.58% <ø> (ø)	⬆️
#windows	41.18% <ø> (?)

Impacted Files	Coverage Δ
snapshots/native/native.go	43.04% <0%> (-9.99%)	⬇️
metadata/snapshot.go	45.8% <0%> (-8.96%)	⬇️
archive/tar.go	43.79% <0%> (-7.07%)	⬇️
metadata/containers.go	47.97% <0%> (-6.62%)	⬇️
content/local/writer.go	57.84% <0%> (-6.36%)	⬇️
content/local/store.go	48.51% <0%> (-5.03%)	⬇️
archive/tar_opts.go	28.57% <0%> (-4.77%)	⬇️
metadata/gc.go	61.51% <0%> (-4.71%)	⬇️
archive/compression/compression.go	58.69% <0%> (-4.7%)	⬇️
metadata/images.go	58.46% <0%> (-4.7%)	⬇️
... and 58 more

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