[llvm] [Github] Add lldb docs step to Github docs action (PR #69832)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/69832

This patch adds a step to build the lldb docs when they change to the Github docs action, enabling easy triage of warnings/docs build failures during the PR process.

>From 7c2cf3360329938cecea0c4a92942c3e2f5b92a9 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <agrossman154 at yahoo.com>
Date: Sat, 21 Oct 2023 03:00:30 -0700
Subject: [PATCH] [Github] Add lldb docs step to Github docs action

This patch adds a step to build the lldb docs when they change to the
Github docs action, enabling easy triage of warnings/docs build failures
during the PR process.
---
 .github/workflows/docs.yml | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 2900f73c77c5a66..b750d8728f65c89 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -15,10 +15,12 @@ on:
     paths:
       - 'llvm/docs/**'
       - 'clang/docs/**'
+      - 'lldb/docs/**'
   pull_request:
     paths:
       - 'llvm/docs/**'
       - 'clang/docs/**'
+      - 'lldb/docs/**'
 
 jobs:
   check-docs-build:
@@ -47,6 +49,8 @@ jobs:
               - 'llvm/docs/**'
             clang:
               - 'clang/docs/**'
+            lldb:
+              - 'lldb/docs/**'
       - name: Setup Python env
         uses: actions/setup-python at v4
         with:
@@ -58,7 +62,8 @@ jobs:
       - name: Install system dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install -y cmake ninja-build
+          # swig and graphviz are lldb specific dependencies
+          sudo apt-get install -y cmake ninja-build swig graphviz
       - name: Build LLVM docs
         if: steps.docs-changed-subprojects.outputs.llvm_any_changed == 'true'
         run: |
@@ -69,4 +74,9 @@ 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 LLDB docs
+        if: steps.docs-changed-subprojects.outputs.lldb_any_changed == 'true'
+        run: |
+          cmake -B lldb-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang;lldb" -DLLVM_ENABLE_SPHINX=ON ./llvm
+          TZ=UTC ninja -C lldb-build docs-lldb-html docs-lldb-man