Build multi-arch images locally, including ARM and RISC-V #46
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This pull request builds upon #40, allowing the use of
makefor building multi-arch images locally and pushing them to the repository. ARM, ARM64 and RISC-V support is included, but other architectures can be easily added in theBUILD_ARCHvariable. The base container has been changed to Alpine (to support RISC-V), which has also made the resulting images even more compact.