ci: add pip caching for docs workflow (#1292)

.github/workflows/publish-docs.yml

@@ -18,10 +18,13 @@ jobs:
         with:
           fetch-depth: 0
       - name: Install mkdocs
+        uses: actions/setup-python@v3
+        with:
+          python-version: '3.10'
+          cache: 'pip'
+          cache-dependency-path: |
+            docs-requirements.txt
         run: |
-          pip install \
-            mkdocs \
-            mkdocs-material \
-            md-toc
+          pip install -r docs-requirements.txt
       - name: Generate docs
         run: mkdocs gh-deploy --strict

docs-requirements.txt

@@ -0,0 +1,3 @@
+mkdocs
+mkdocs-material
+md-toc