Add GH action cache

.github/workflows/test.yml

@@ -69,11 +69,31 @@ jobs:
           libxml2-dev \
           libxslt-dev
 
+    - name: Enable pip cache
+      run: |
+        echo "PIP version: $(pip --version)"
+        mkdir -p ~/.cache/pip
+        pip install -U pip --cache-dir ~/.cache/pip
+        chown -R $(whoami) ~/.cache/pip
+
+    - uses: actions/cache@v3
+      id: cache
+      with:
+        path: |
+          ~/.cache/pip
+          .
+          /usr/lib/python*/site-packages
+        key: ${{ runner.os }}-spatial-ckan-${{ matrix.ckan-version }}-${{ hashFiles('*requirements*.txt') }}
+        restore-keys: |
+          ${{ runner.os }}-spatial-ckan-${{ matrix.ckan-version }}-${{ hashFiles('*requirements*.txt') }}
+
     - name: Install dependencies from ${{ matrix.requirements-file }}
+      if: steps.cache.outputs.cache-hit != 'true'
       run: |
         pip install -r ${{ matrix.requirements-file }}
 
     - name: Install harvester
+      if: steps.cache.outputs.cache-hit != 'true'
       run: |
         echo "Installing harvester"
         git clone --depth 1 https://github.com/ckan/ckanext-harvest
@@ -88,10 +108,14 @@ jobs:
         pip install -e .
 
     - name: Install requirements
+      if: steps.cache.outputs.cache-hit != 'true'
+      run: pip install -e .
+
+    - name: Replace default path to CKAN
       run: |
-        pip install -e .
         # Replace default path to CKAN core config file with the one on the container
         sed -i -e 's/use = config:.*/use = config:\/srv\/app\/src\/ckan\/test-core.ini/' test.ini
+
     - name: Run tests
       run: pytest --ckan-ini=test.ini --cov=ckanext.spatial --cov-report=xml --cov-append --disable-warnings ckanext/spatial/tests