use circleci for docker builds

.circleci/config.yml

@@ -108,15 +108,44 @@ jobs:
                   key: frontend-dependencies-{{ checksum "package.json" }}
 
             - run:
-          name: test frontend
+                  name: build frontend
                   command: cd frontend && npm run build
 
+    build:
+        machine:
+            image: ubuntu-2004:202107-01
+        working_directory: ~/photos
+
+        steps:
+            - checkout
+            - run:
+                  name: log in to docker hub
+                  command: echo "$DOCKER_PASSWORD" | docker login --username $DOCKER_USERNAME --password-stdin
+
+            - run:
+                  name: install emulators
+                  command: docker run --privileged --rm tonistiigi/binfmt --install all
+
+            - run:
+                  name: create docker builder
+                  command: docker buildx create --use
+
+            - run:
+                  name: build and push to docker hub
+                  #command: docker buildx build --push --platform linux/arm/v7,linux/arm64/v8,linux/amd64 --tag stepanusatiuk/photos:latest .
+                  command: docker buildx build --push --platform linux/amd64 --tag stepanusatiuk/photos:latest .
+
 workflows:
     version: 2
-  test:
+    test-build:
         jobs:
             - test-backend
             - test-frontend
             - test-frontend-build:
                   requires:
                       - test-frontend
+            - build:
+                  requires:
+                      - test-backend
+                      - test-frontend
+                      - test-frontend-build