Install only docs in publish

.github/workflows/publish.yml

@@ -31,11 +31,16 @@ jobs:
         with:
           path: ~/.local
           key: poetry-${{ runner.os }}-${{ env.POETRY_VERSION  }}-${{ steps.setup-python.outputs.python-version }}
-      - name: Expect Poetry cached
-        id: expect-cached-poetry
+      - name: Install Poetry
+        id: install-poetry
         if: steps.cached-poetry.outputs.cache-hit != 'true'
-        run: echo "Expected cached Poetry installation, but it was not found." && exit 1
-
+        uses: snok/install-poetry@v1
+        # If changing any of these, you must comment out the if statement above.
+        with:
+          version: ${{ env.POETRY_VERSION }}
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+          installer-parallel: true
       - name: Poetry git plugin
         run: poetry self add poetry-git-version-plugin
 
@@ -45,13 +50,12 @@ jobs:
         with:
           path: .venv
           key: venv-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
-      - name: Expect environment cached
-        if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
-        run: echo "Expected cached environment, but it was not found." && exit 1
 
       - name: Poetry Build
         run: poetry build -v
 
+      - name: Poetry Install
+        run: poetry install -v --only=docs
       - name: MKDocs Build
         run: poetry run mkdocs build