Recently the LetsEncrypt DST certificate has expired.
Older versions of OpenSSL like v1.0.x have issues using this certificate.
Recently clux has updated his image to support OpenSSL v1.1.1[a-z].
This solves issues with those certificates.
This issues was disscused on Matrix.
- Split Debian and Alpine into different build matrix
This starts building both Debian and Alpine based images at the same time
- Make use of Docker BuildKit, which improves speed also.
- Use BuildKit caching for Rust Cargo across docker images.
This prevents downloading the same crates multiple times.
- Use Github Actions Services to start a docker registry, starting it
via the build script sometimes caused issues.
- Updated the Build workflow to use Ubuntu 20.04 which is more close to
the Bullseye Debian release regarding package versions.
