Fix install error

Author: rhpvorderman

.github/workflows/ci.yml

@@ -21,8 +21,6 @@ jobs:
         uses: actions/setup-python@v2
       - name: Install tox
         run: pip install tox
-      - name: Install isal
-        run: sudo apt-get install libisal-dev
       - name: Lint
         run: tox -e lint
   docs:
@@ -34,6 +32,8 @@ jobs:
         uses: actions/setup-python@v2
       - name: Install tox
         run: pip install tox
+      - name: Install isal
+        run: sudo apt-get install libisal-dev
       - name: Build docs
         run: tox -e docs
   test: