Add docker build to test ci

Author: Nikos410

.github/workflows/test.yml

@@ -16,11 +16,21 @@ jobs:
         with:
           go-version: 1.17
 
+      - name: Check formatting
+        run: go fmt ./... && git diff --exit-code
+
       - name: Build
         run: go build -v ./...
 
       - name: Test
         run: go test -v ./...
 
-      - name: Check formatting
-        run: go fmt ./... && git diff --exit-code
+      - name: Set up Docker Build
+        uses: docker/setup-buildx-action@v1
+
+      - name: Build using docker
+        uses: docker/build-push-action@v2
+        with:
+          context: ./
+          file: ./Dockerfile
+          push: false