[Merged by Bors] - ci: Retry logic for linting step

[marcelolynch]

We should continue our investigation in the separate mirror pipeline and do this to avoid blocking our users: for this, let's make the linting invocation auto-retry after a 20 minute timeout. We still keep a 60min step timeout for good measure, but it shouldn't be necessary.

[github-actions]

PR summary 95093e961c

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

---

Declarations diff

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

---

No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[bryangingechen]

Let's try it out!
bors r+

Just in case things go wrong
bors d+

[mathlib-bors]

✌️ marcelolynch can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

[mathlib-bors]

Canceled.

[marcelolynch]

bors try

[mathlib-bors]

try

Build failed:

• Post-Build Step

[marcelolynch]

bors try

[marcelolynch]

bors r+

[mathlib-bors]

try

Build succeeded:

• Lint style
• Build
• Post-Build Step

[mathlib-bors]

Pull request successfully merged into master.

Build succeeded:

• Lint style
• Build
• Post-Build Step