[llvm] workflows/release-documentation: Rework workflow to make it testable (PR #212689)

[Tom Stellard via llvm-commits]

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@@ -38,76 +38,42 @@ on:
       LLVM_TOKEN_GENERATOR_PRIVATE_KEY:
         description: "Private key for our GitHub App we use for generating access tokens."
         required: true
+  # Run on pull_requests for testing purposes.
+  pull_request:
+    paths:
+      - '.github/workflows/release-documentation.yml'
+      - 'llvm/utils/release/build-docs.sh'
+    types:
+      - opened
+      - synchronize
+      - reopened
+      # When a PR is closed, we still start this workflow, but then skip
+      # all the jobs, which makes it effectively a no-op.  The reason to
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tstellar wrote:

Fixed now, good catch.

https://github.com/llvm/llvm-project/pull/212689