Replace docker-compose with docker in GitHub Workflow

The GitHub Workflow (docker.yml) has been refactored to replace docker-compose with docker. This involves changes in the installation instructions and the commands to build and test the Docker image. This simplifies the workflow and allows the use of standard Docker commands instead of docker-compose.

.forgejo/workflows/docker.yml

@@ -15,17 +15,17 @@ jobs:
     runs-on: docker
     steps:
     - uses: actions/checkout@v3
-    - name: Install docker-compose
+    - name: Install docker
       run: |
-        apt-get update; apt-get -y install docker-compose; which docker-compose
+        apt-get update; apt-get -y install docker; which docker
     - name: Build the Docker image
-      run: docker-compose build --no-cache --force-rm
+      run: docker build --no-cache --force-rm -t apg-go:main .
   test:
     runs-on: docker
     steps:
       - uses: actions/checkout@v2
       - name: Test the Docker image
-        run: docker-compose up -d
+        run: docker run apg-go:main
   push_to_registry:
     name: Push Docker image to Docker Hub
     runs-on: docker