github: Replace deprecated docker-compose calls

The command is not available anymore on the build hosts.

.github/workflows/ci.yml

@@ -40,15 +40,15 @@ jobs:
         echo "PATH=$HOME/.local/bin:$PATH" >> $GITHUB_ENV
     - name: Build Docker images and start containers
       run: |
-        docker-compose build
-        docker-compose up -d
+        docker compose build
+        docker compose up -d
         sleep 5
     - name: Run unit tests, collect coverage
-      run: docker-compose exec -T roadwarrior /bin/sh -c "cd /strongMan; ./runtests.py"
+      run: docker compose exec -T roadwarrior /bin/sh -c "cd /strongMan; ./runtests.py"
     - name: Run integration tests
-      run: docker-compose exec -T roadwarrior /bin/sh -c "cd /strongMan; python manage.py test strongMan.tests.integration_tests --settings=strongMan.settings.local;"
+      run: docker compose exec -T roadwarrior /bin/sh -c "cd /strongMan; python manage.py test strongMan.tests.integration_tests --settings=strongMan.settings.local;"
     - name: Submit coverage
       if: ${{ success() }}
       run: |
-        docker-compose exec -T roadwarrior cat /strongMan/.coverage > .coverage
+        docker compose exec -T roadwarrior cat /strongMan/.coverage > .coverage
         coveralls --service=github

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '2.1'
-
 services:
   gateway:
     command: "ipsec start --nofork"