build(image): overwrite base image annotations

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The Alpine base image sets annotations that the Parca image should overwrite:

$ regctl manifest get ghcr.io/parca-dev/parca:v0.25.0 --platform=linux/amd64 --format='{{printPretty .Annotations}}'
{
  "com.docker.official-images.bashbrew.arch": "amd64",
  "org.opencontainers.image.base.digest": "sha256:85f2b723e106c34644cd5851d7e81ee87da98ac54672b29947c052a45d31dc2f",
  "org.opencontainers.image.base.name": "docker.io/library/alpine@sha256:4b7ce07002c69e8f3d704a9c5d6fd3053be500b7f1c69fc0d80990c2ad8dd412",
  "org.opencontainers.image.created": "2025-10-08T11:04:56Z",
  "org.opencontainers.image.revision": "4dc13cbc7caffe03c98aa99f28e27c2fb6f7e74d",
  "org.opencontainers.image.source": "https://github.com/alpinelinux/docker-alpine.git#4dc13cbc7caffe03c98aa99f28e27c2fb6f7e74d:x86_64",
  "org.opencontainers.image.url": "https://hub.docker.com/_/alpine",
  "org.opencontainers.image.version": "3.22.2"
}

Note: This is different from the labels

Labels

$ regctl image inspect ghcr.io/parca-dev/parca:v0.25.0 --format='{{printPretty .Config.Labels}}'
{
  "io.buildah.version": "1.33.7",
  "org.opencontainers.image.description": "Continuous profiling for analysis of CPU and memory usage, down to the line number and throughout time. Saving infrastructure cost, improving performance, and increasing reliability.",
  "org.opencontainers.image.licenses": "Apache-2.0",
  "org.opencontainers.image.source": "https://github.com/parca-dev/parca",
  "org.opencontainers.image.url": "https://github.com/parca-dev/parca"
}