Make conda available in worker docker container PATH and change miniconda download location

[umesh-timalsina]

conda is not available on worker docker container path

docker pull deepforge/worker:latest
latest: Pulling from deepforge/worker
Digest: sha256:9b45642ba6a40551d15a099a68e485236ce5cdfd99064aa388641efd8b8b586b
Status: Image is up to date for deepforge/worker:latest
docker.io/deepforge/worker:latest

docker run -it  --entrypoint /bin/bash deepforge/worker:latest 
root@0c3336a00985:/deepforge-worker# which conda
root@0c3336a00985:/deepforge-worker# conda
bash: conda: command not found
root@0c3336a00985:/deepforge-worker#