🚧 github: Add a test job

.github/workflows/build.yml

@@ -29,3 +29,21 @@ jobs:
     with:
       subimage: ${{ matrix.subimage }}
     secrets: inherit
+
+  test:
+    needs: build-rest
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Install wrapper
+        run: |
+          apt-get install python3-pip
+          cd wrapper && pip install .
+      -
+        name: Test
+        run: |
+          ocrd --version
+          ocrd-dinglehopper --version