Reduce CPU usage

Adding the argument -s 10 when running the pigpiod daemon will almost half the CPU usage as per this topic.

But this is not the default behavior and will have some disadvantages as well. Read more about this on the link.

My tests show me no degraded functions just as others have reported so I put this into the default runtime.

To reverse back from this add this to your docker-compose.yml file:

    command: pigpiod -g -a 1 # For 32 bits
    command: pigpiod -g # For 64 bits

Auto Alpine image update checker

To improve security on hosted images on hub.docker.com

Changes:

• Github Action looks for new release of Alpine base image on docker
• Specific images with OS variants like arm/v7 is no longer released separate but included inside latest

Full Changelog: v1.1.0...1.2.0

Automated some stuff

• Github action now checks regularly for updated releases of pigpio.
  • On new release, the docker image is test build and made into a pull request to quickly adopt new versions of pigpio (#7).
• Description on docker hub is automatic updated when README.md is changed.
  • Icons in README.md changed from github icons to unicode characters to work better on docker hub.
• The layers of the docker image is reduced as pr. docker best practice guide (#9).
• docker-compose.yml and example in README.md do not run the container as privileged anymore (#10).
• pigpio v76 and v78 is now tested and confirmed to work on raspberry pi 3 32-bit. This is added to README.md.

Initial release

Initial release only tested on raspberry pi 1.
Running pigpiod version 76.