[DEV] Fix docker image publishing

Author: hypherionmc

.github/workflows/docker-publish.yml

@@ -38,3 +38,8 @@ jobs:
         run: |
           docker tag ghcr.io/${{ github.repository_owner }}/docktainer:${{ github.sha }} ghcr.io/${{ github.repository_owner }}/docktainer:${{ github.ref_name }}
           docker push ghcr.io/${{ github.repository_owner }}/docktainer:${{ github.ref_name }}
+
+      - name: Tag Docker image as latest
+        run: |
+          docker tag ghcr.io/${{ github.repository_owner }}/docktainer:${{ github.sha }} ghcr.io/${{ github.repository_owner }}/docktainer:latest
+          docker push ghcr.io/${{ github.repository_owner }}/docktainer:latest