ci: build docs on pr (#8089)

scripts/build_html_examples.sh

@@ -1,14 +1,30 @@
 #!/bin/bash
+
 set -e
+
+# These variables allow us to specify an alternate repository URL and commit reference
+# This is particularly useful when running in CI environments for pull requests
+# where we need to build from the contributor's forked repository
+REPO_URL="${1:-}"
+COMMIT_REF="${2:-}"
+
 export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
-CURRENT_REF="$(git rev-parse HEAD)"
 rm -rf emscripten_builder
 git clone https://github.com/lvgl/lv_sim_emscripten.git emscripten_builder
 scripts/genexamplelist.sh > emscripten_builder/examplelist.c
 cd emscripten_builder
 git submodule update --init -- lvgl
 cd lvgl
-git checkout $CURRENT_REF
+if [ -n "$REPO_URL" ] && [ -n "$COMMIT_REF" ]; then
+  echo "Using provided repo URL: $REPO_URL and commit ref: $COMMIT_REF for lvgl submodule"
+  git remote set-url origin "$REPO_URL"
+  git fetch origin
+  git checkout "$COMMIT_REF"
+else
+  CURRENT_REF="$(git rev-parse HEAD)"
+  echo "Using current commit ref: $CURRENT_REF for lvgl"
+  git checkout "$CURRENT_REF"
+fi
 cd ..
 mkdir cmbuild
 cd cmbuild