Add github workflow to build images

.github/workflows/build.yml

@@ -0,0 +1,32 @@
+# on:
+#   push:
+#     branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v2
+
+    - name: Log in to GitHub Container Registry
+      uses: docker/login-action@v1
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Build and push frontend image
+      uses: docker/build-push-action@v2
+      with:
+        context: frontend/
+        push: true
+        tags: ghcr.io/${{ github.repository_owner }}/youtube-dj/frontend
+
+    - name: Build and push backend image 
+      uses: docker/build-push-action@v2
+      with:
+        context: frontend/
+        push: true
+        tags: ghcr.io/${{ github.repository_owner }}/youtube-dj/backend