fix: update actions and change to a private package

Refs: #57

Author: OlaBekkevold

.github/workflows/build.yml

@@ -17,14 +17,14 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Log in to container registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: olabekkevold
-          password: ${{ secrets.GITHUB_TOKEN }}
+          password: ${{ secrets.PAT }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           context: ./labman
           push: true