[DOC] clarify steps in local docker example #3589
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What this PR does:
Two things:
Mention needing to docker login to the github registry. When I tried this example, I got permission denied until I did this.
Mention a debugging step about write permissions on the tempo-data folder. When I followed this guide, I ran into the error I describe here. Hopefully these two clarifications will help out the next person.
Which issue(s) this PR fixes:
No issue fixed.