Added concurrency section to Publish Website workflow (Issue 575) #583
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When builds are triggered within about 4 min of each other, the parallel calls to GitHub's GraphQL API clobber one another. Even with a throttling helper, the clobbering results in a too-many-requests API error, and the build fails.
This small change should hopefully prevent this error in the future. It will check if the build/workflow is already running, and if so, cancels it. If there are multiple builds in quick succession, only the latest one will publish.