fix Filer startup failure due to JWT on / path #8149 (#8167)

* fix Filer startup failure due to JWT on / path #8149

- Comment out JWT keys in security.toml.example
- Revert Dockerfile.local change that enabled security by default
- Exempt GET/HEAD on / from JWT check for health checks

* refactor: simplify JWT bypass condition as per PR feedback

docker/Dockerfile.local

@@ -4,7 +4,6 @@ COPY  ./weed /usr/bin/weed
 RUN chmod +x /usr/bin/weed && ls -la /usr/bin/weed
 RUN mkdir -p /etc/seaweedfs
 COPY ./filer.toml /etc/seaweedfs/filer.toml
-COPY ./security.toml.example /etc/seaweedfs/security.toml
 COPY ./entrypoint.sh /entrypoint.sh
 
 # Install dependencies and create non-root user