Add sqry-mcp container image (Docker + Podman)

[verivusOSS-releases]

Adds a container image for the sqry-mcp server (stdio, 38 tools). This unblocks the MCP-ecosystem listings that now gate on a runnable container: Glama's listing check (which the awesome-mcp-servers PR depends on) and the official MCP Registry (oci package type).

• docker/Dockerfile and docker/Containerfile (Podman): multi-stage, install the prebuilt sqry-mcp-linux-{amd64,arm64} release binary (no full Rust/tree-sitter compile).
• Runtime is gcr.io/distroless/cc-debian12. All 26 release assets were checked and both the full sqry and sqry-mcp binaries are glibc-dynamic (ldd: glibc + libstdc++6); there is no musl/static build, so distroless/cc is the minimal base carrying exactly those libs and nothing else. A FROM scratch image would require a static build target in the release matrix.
• Runs standalone (--no-daemon), SQRY_MCP_WORKSPACE_ROOT=/workspace, SQRY_REDACTION_PRESET=relative so results are workspace-relative and map back to the host checkout.
• Carries the io.modelcontextprotocol.server.name=dev.sqry/sqry image label, so a published image self-certifies to the MCP Registry as an oci package (no crate-README marker release needed).
• docker/README.md: build, run, bind-mount, and MCP-client-config docs, including the --user (Docker) and rootless/:Z (Podman) notes.

Verified against the v27.0.8 release binary on linux/amd64: sqry-mcp --list-tools returns 38 tools, --version reports 27.0.8, and ldd shows the runtime needs only glibc + libstdc++6.

Follow-ups (not in this PR): build and push the image (e.g. ghcr.io/verivus-oss/sqry-mcp), submit it to Glama, and publish server.json to the MCP Registry. A static (musl) release target would additionally enable a FROM scratch image.

[verivusOSS-releases]

Closing: this targets the generated public mirror (populated by release-distribute from verivusai-labs/sqry), and it duplicates the existing internal packaging/docker/Dockerfile. Container packaging and the MCP server manifest belong in verivusai-labs/sqry, where sqry-mcp/server.json and register-mcp-registry.sh already exist. Will redirect there.