Configure maven to ignore missing checksums for the repositories we define
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### What needs to get done
The "local" Maven repositories we define (the one in `/usr/share/maven-repo` for archive packages and the one in the backstage for parts) are typically missing the checksum file because the poms are modified at runtime. This means that Maven floods the build output with warnings, but we can configure Maven to ignore missing checksums **for those repos specifically** via the [checksumPolicy](https://maven.apache.org/settings.html) element.
### Why it needs to get done
The warnings are very noisy and make it hard to find actual errors.
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