github: Add GitHub action to build docs.

This builds docs, but only on pull requests that change a file in the
docs/ directory.

1 files changed, 18 insertions, 0 deletions

diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
new file mode 100644
index 000000000..ec6b4c7f1
--- /dev/null
+++ b/.github/workflows/docs.yml
@@ -0,0 +1,18 @@
+name: Build docs
+
+on:
+  pull_request:
+    paths:
+      - docs/**
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v1
+    - name: Install Python packages
+      run: pip install Sphinx
+    - name: Build docs
+      run: make -C docs/ html