fix dockerfile path in workflow

Author: jamesamcl

.github/workflows/docker.yml

@@ -29,7 +29,7 @@ jobs:
 
       - name: Build and push Docker image
         run: |
-          docker build -t ghcr.io/ebispot/ols-semsim:${{ github.sha }} -f ./semsim/Dockerfile .
+          docker build -t ghcr.io/ebispot/ols-semsim:${{ github.sha }} .
           docker tag ghcr.io/ebispot/ols-semsim:${{github.sha}} ghcr.io/ebispot/ols-semsim:${{ github.head_ref || github.ref_name }}
           docker push --all-tags ghcr.io/ebispot/ols-semsim