CI: split docs into separate GitHub Action (#1660)

.github/workflows/docs.yml

@@ -0,0 +1,36 @@
+name: Build documentation ⚙️
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'docs/**'
+  pull_request:
+    branches:
+      - master
+    paths:
+      - 'docs/**'
+  release:
+    types:
+      - released
+
+jobs:
+  main:
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        include:
+          - python-version: '3.10'
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+      name: Setup Python ${{ matrix.python-version }}
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install requirements 📦
+      run: |
+        pip3 install -r requirements.txt
+        pip3 install -r docs/requirements.txt
+    - name: build docs 🏗️
+      run: cd docs && make html

.github/workflows/main.yml

@@ -4,11 +4,13 @@ on:
   push:
     paths-ignore:
       - '**.md'
+      - 'docs/**'
   pull_request:
     branches:
       - master
     paths-ignore:
       - '!**.md'
+      - 'docs/**'
   release:
     types:
       - released
@@ -90,7 +92,6 @@ jobs:
         pip3 install -r requirements-dev.txt
         pip3 install -r requirements-provider.txt
         pip3 install -r requirements-django.txt
-        pip3 install -r docs/requirements.txt
         python3 setup.py install
         pip3 install --upgrade numpy elasticsearch
         pip3 install --upgrade numpy "sqlalchemy<2"
@@ -139,8 +140,6 @@ jobs:
         pytest tests/test_util.py
         pytest tests/test_xarray_netcdf_provider.py
         pytest tests/test_xarray_zarr_provider.py
-    - name: build docs 🏗️
-      run: cd docs && make html
     - name: failed tests 🚩
       if: ${{ failure() }}
       run: |