feat: build artifactapi container (#25)

- build artifactapi container

Reviewed-on: #25

images/almalinux/9.6/artifactapi/builds

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+docker

images/almalinux/9.6/artifactapi/variables.auto.pkrvars.hcl

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+# almalinux/9.6/rpmbuilder
+docker_source = "git.unkin.net/unkin/almalinux9-base:latest"
+packages = [
+  "sudo"
+]
+scripts_post_packages = [
+  "git clone https://git.unkin.net/unkin/artifactapi.git /app/artifactapi && uv build --wheel /app/artifactapi",
+  "useradd -m -r -s /bin/sh appuser && chown -R appuser:appuser /app",
+  "sudo -u appuser uv tool install --from /app/artifactapi/dist/*.whl artifactapi",
+]
+scripts_final = [
+  "dnf clean all",
+  "rm -rf /var/cache/dnf"
+]
+docker_changes = [
+  "EXPOSE 8000",
+  "HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 CMD curl -f http://localhost:8000/health || exit 1",
+  "USER appuser",
+  "ENV PATH=\"/home/appuser/.local/bin:$PATH\"",
+  "WORKDIR /app",
+  "CMD [\"artifactapi\"]"
+]

images/almalinux/9.6/artifactapi/version

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+20260106