Working image.

.dockerignore

+*

.gitignore

+~*
+*~
+*.sw[op]
+*.py[cod]
+.DS_Store
+__pycache__/
+.vagrant/
+vendor/
+Thumbs.db
+*.retry
+.svn/
+.sass-cache/
+*.log
+a.out
+node-modules/
+nbproject/
+*.ipynb
+.idea/
+*.egg-info/
+*.o
+.classpath
+.cache/
+bower_components/
+*.class
+*.jar
+secring.*
+.*.kate-swp
+.swp.*
+.directory
+.Trash-*
+build/
+_build/
+dist/
+.tox/

Dockerfile

+FROM alpine:3.9 as downloader
+ARG URL=https://github.com/aptible/supercronic/releases/download/v0.1.8/supercronic-linux-amd64
+ARG SHA1SUM=be43e64c45acd6ec4fce5831e03759c89676a0ea
+RUN cd /tmp && \
+    wget $URL && \
+    echo "$SHA1SUM  supercronic-linux-amd64" > sha1.sum && \
+    sha1sum -c sha1.sum && \
+    install -m 755 supercronic-linux-amd64 /usr/local/bin/supersonic && \
+    touch /crontab
+
+FROM alpine:3.9
+COPY --from=downloader /usr/local/bin/supersonic /usr/local/bin/supersonic
+COPY --from=downloader /crontab /crontab
+WORKDIR /tmp
+USER nobody
+CMD [ "supersonic", "/crontab" ]
+HEALTHCHECK CMD pgrep supersonic
+RUN supersonic -test /crontab

LICENSE.txt

+MIT License
+
+Copyright (c) 2019 Adar Nimrod
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

+# Cron docker
+
+A Docker image for running a Cron daemon, actually running
+[Supersonic](https://github.com/aptible/supercronic).
+
+## Usage
+
+There are possible usage patterns for this image. The first is using it in a
+multi-stage image build as the source of the `supersonic` binary to incorporate
+in your own image like so:
+
+```
+FROM adarnimrod/cron as supersonic
+
+FROM alpine:latest
+COPY --from=supersonic /usr/local/bin/supersonic /usr/local/bin/
+```
+
+The other pattern is building on top of this image to run some periodic tasks
+like so:
+
+```
+FROM adarnimrod/cron
+RUN apk add --update --no-cache aws-cli
+COPY crontab /crontab
+COPY script /usr/local/bin/
+```
+
+## License
+
+This software is licensed under the MIT license (see `LICENSE.txt`).