Merge pull request #21 from PDOK/github-action-to-dockerhub

use dockerhub in github action

.github/workflows/build.yml

@@ -30,7 +30,7 @@ jobs:
         if: startsWith(env.image, 'pdok/')
         uses: docker/login-action@v1
         with:
-          username: pdokdev
+          username: koalapdok
           password: ${{ secrets.DOCKERHUB_PUSH }}
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1