Correctly fix working directory for Docker image build

Author: brycelelbach

.github/workflows/build-docker-image.yml

@@ -34,7 +34,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build Docker image with Compose
-        run: docker compose -f build/docker-compose.yml .
+        run: docker compose -f build/docker-compose.yml build
 
       - name: Tag Docker images
         run: |

build/docker-compose.yml

@@ -1,9 +1,7 @@
-version: '3.8'
-
 services:
   backend:
     build:
-      context: .
+      context: ..
       dockerfile: build/dockerfile
     image: ghcr.io/pyhpc/pyhpc-tutorial:latest
     pull_policy: always