Add workflow for testing docker image.

.github/workflows/package.yaml

@@ -3,7 +3,7 @@ name: Build Python package
 on: [push, pull_request]
 
 jobs:
-  build-package:
+  dry-run:
 
     runs-on: ubuntu-latest
 

.github/workflows/tests.yaml

@@ -64,6 +64,37 @@ jobs:
       run: |
         coveralls --service=github
 
+  test-docker:
+    name: Build docker image and run tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-qemu-action@v3
+      - uses: docker/setup-buildx-action@v3
+
+      - name: Cache docker layers
+        uses: actions/cache@v3
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: ${{ runner.os }}-buildx-
+
+      - name: Build image run unit tests
+        env:
+          IMAGE: ${{ github.repository }}:${{ github.sha }}
+          NAME: deepcell-spots-test
+        run: |
+          docker buildx build --load --tag ${{ env.IMAGE }} .
+          docker run -d -it \
+            --entrypoint=bash \
+            --name ${{ env.NAME }} \
+            ${{ env.IMAGE }}
+          docker cp requirements-test.txt ${{ env.NAME }}:/opt/deepcell-spots/requirements-test.txt
+          docker exec ${{ env.NAME }} pip install -r /opt/deepcell-spots/requirements-test.txt
+          docker exec ${{ env.NAME }} pytest /opt/deepcell-spots/deepcell
+          docker kill ${{ env.NAME }} && docker rm ${{ env.NAME }}
+
+
   coveralls:
     name: Finish Coveralls
     needs: tests