Sheriffing/How To/Sccache issues

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If a job fails with "sccache: encountered fatal error", it can be fixed like this:

1. Select the busted job on Treeherder.
2. Click "...", then "Edit and Retrigger"
3. In the "Create Task" textbox, under env, add "SCCACHE_RECACHE: '1'"
4. Create the task. It will show up in treeherder.
5. Wait for it to finish.
6. Once it's green, other failing jobs of the same type can then be retriggered (so if a linux32-opt busted and you triggered a task with SCCACHE_RECACHE for linux32-opt, you can then retrigger the other busted linux32-opts, assuming they were getting the same broken object).