Update versioneer to remove distutils dependency (#364)

* Update versioneer to remove distutils dependency

* No need to setup Python as it uses the version in the venv

* Add verioneer dependency

.github/workflows/build.yml

@@ -13,7 +13,7 @@ on:
 
 jobs:
   build:
-    name: "Build Thetis"  
+    name: "Build Thetis"
     # The type of runner that the job will run on
     runs-on: self-hosted
     # The docker container to use.
@@ -26,10 +26,6 @@ jobs:
         run: |
           cd ..
           rm -rf build
-      - name: Setup python
-        uses: actions/setup-python@v2
-        with:
-          python-version: 3.8
       - name: Install Thetis
         run: |
           . /home/firedrake/firedrake/bin/activate

requirements.txt

@@ -5,3 +5,4 @@ uptide
 pytz
 traitlets
 pylit
+versioneer

thetis/__init__.py

@@ -26,3 +26,6 @@
 
 thetis_log_level(DEBUG)
 set_thetis_loggers(comm=COMM_WORLD)
+
+from . import _version
+__version__ = _version.get_versions()['version']