x-yuri/docker + fcron.md

## docker + fcron.md

      
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              docker + fcron.md
            
          
    docker + fcron

Use -d to make it more verbose.
docker-compose.yml:
services:
  fcron:
    build: .
    command: fcron -f
Dockerfile:
FROM alpine:3.17
COPY crontab .
RUN set -x \
    && apk add --no-cache fcron shadow \
    && useradd -m app \
    && fcrontab crontab app
crontab:
* * * * * date