fix: use previous git context in build and push action

.gitea/workflows/build.yml

@@ -21,11 +21,9 @@ jobs:
           username: alice-bot
           password: ${{ secrets.GT_TOKEN }}
 
-      - run: |
-          echo "Building tag ${{ gitea.ref_name }} | ${{ env.GITHUB_REF_NAME }}"
-
       - name: Build and push
         uses: docker/build-push-action@v5
         with:
+          context: .
           push: true
           tags: git.rabbithole.cyou/paravielfalt/mastodon:${{ gitea.ref_name }}