Merge pull request #20 from PDOK/github-action-to-dockerhub

use dockerhub in github action

.github/workflows/build.yml

@@ -31,7 +31,7 @@ jobs:
         uses: docker/login-action@v1
         with:
           username: pdokdev
-          password: ${{ secrets.DOCKERHUB }}
+          password: ${{ secrets.DOCKERHUB_PUSH }}
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
       - name: Cache Docker layers