[llvm] [Github] Add libunwind to docs CI (PR #69830)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/69830

This patch adds the libunwind docs to the Github docs action which enables easy triage of docs build failures in Github PRs. There is already buildbot coverage of this configuration, but it is much less convenient to use in PRs.

>From c779120a6dc6d2fc28b2d2dc51195808ae67a6f3 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <agrossman154 at yahoo.com>
Date: Sat, 21 Oct 2023 02:52:24 -0700
Subject: [PATCH] [Github] Add libunwind to docs CI

This patch adds the libunwind docs to the Github docs action which
enables easy triage of docs build failures in Github PRs. There is
already buildbot coverage of this configuration, but it is much less
convenient to use in PRs.
---
 .github/workflows/docs.yml | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 2900f73c77c5a66..f9693f4390a3a57 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -15,10 +15,12 @@ on:
     paths:
       - 'llvm/docs/**'
       - 'clang/docs/**'
+      - 'libunwind/docs/**'
   pull_request:
     paths:
       - 'llvm/docs/**'
       - 'clang/docs/**'
+      - 'libunwind/docs/**'
 
 jobs:
   check-docs-build:
@@ -47,6 +49,8 @@ jobs:
               - 'llvm/docs/**'
             clang:
               - 'clang/docs/**'
+            libunwind:
+              - 'libunwind/docs/**'
       - name: Setup Python env
         uses: actions/setup-python at v4
         with:
@@ -69,4 +73,9 @@ jobs:
         run: |
           cmake -B clang-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang" -DLLVM_ENABLE_SPHINX=ON ./llvm
           TZ=UTC ninja -C clang-build docs-clang-html docs-clang-man
+      - name: Build libunwind docs
+        if: steps.docs-changed-subprojects.outputs.libunwind_any_changed == 'true'
+        run: |
+          cmake -B libunwind-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_RUNTIMES="libunwind" -DLLVM_ENABLE_SPHINX=ON ./runtimes
+          TZ=UTC ninja -C libunwind-build docs-libunwind-html