fix: mount README.md to / not /data for docker-pushrm

The docker-pushrm image (busybox-based) has no WORKDIR set, defaulting
to /. FindReadmeFile() searches ./ relative to WORKDIR, so the file
must be at /README.md, not /data/ or /workspace/.

.gitea/workflows/build-and-deploy.yml

@@ -78,7 +78,7 @@ jobs:
       - name: Push README to Docker Hub
         run: >
           docker run --rm
-          -v "$(pwd)/README.md:/data/README.md:ro"
+          -v "$(pwd)/README.md:/README.md:ro"
           -e DOCKER_USER="${{ vars.DOCKER_HUB_USERNAME }}"
           -e DOCKER_PASS="${{ secrets.DOCKER_HUB_TOKEN }}"
           chko/docker-pushrm:latest