Use distroless base image for runtime container images#7637
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Switch the cortex, query-tee, thanosconvert, and test-exporter runtime images from alpine:3.23 to gcr.io/distroless/static-debian12. The binaries are fully static (CGO_ENABLED=0, netgo), so they have no shell or libc dependency at runtime. CA certificates are bundled in the distroless image, so the apk ca-certificates install is dropped. The image continues to run as root (uid 0) so the default HTTP listen port 80 keeps binding. Signed-off-by: Charlie Le <charlie_le@apple.com>
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What this PR does
Switches the runtime container images from
alpine:3.23togcr.io/distroless/static-debian12for all four runtime binaries:cmd/cortex/Dockerfilecmd/query-tee/Dockerfilecmd/thanosconvert/Dockerfilecmd/test-exporter/DockerfileThe Cortex binaries are already built fully static and CGO-free (
CGO_ENABLED=0,-extldflags "-static" -tags "netgo slicelabels"), so they have no shell or libc dependency at runtime — a clean fit for distroless. This reduces image size and attack surface (no shell, no package manager, no busybox).Notes
gcr.io/distroless/static-debian12(/etc/ssl/certs/ca-certificates.crt), so theapk add --no-cache ca-certificatesstep is dropped. TLS to object storage (S3/GCS/etc.) continues to work.:nonrootvariant. Cortex's defaultserver.http-listen-portis80, a privileged port; staying root keeps the default config and the integration tests (which bind port 80) working with no breaking change. The base image is exposed as an overridableBASEIMGARG so CI can pin to an immutable digest./readyreadiness probe.Checklist