ROX-31485: Add Dockerfile

[mtodor]

Description

This PR is adding the following changes:

• Dockerfile to build MCP server image
• /health endpoint to support K8s deployment readiness
• new target in Makefile
• documentation update in README
• bump go version to 1.25
• add dockerfile linter

Validation

• build image locally
• run docker container and test with MCP inspector
• validate that /health endpoint works

Info about layer caching

[1/2] STEP 1/10: FROM registry.access.redhat.com/ubi10/ubi:latest AS builder
[1/2] STEP 2/10: ARG TARGETOS=linux
--> Using cache 9bd8d6b87dc7fe94cf6e9a71a1c5404ab3985d6a4bd3e1920e646d69b9b9daf5
--> 9bd8d6b87dc7
[1/2] STEP 3/10: ARG TARGETARCH=amd64
--> Using cache 08722e7b3772a42b01126f9db37606cb52716dd6efebbed841d804f6cdb1126d
--> 08722e7b3772
[1/2] STEP 4/10: ARG VERSION=dev
--> Using cache 7fd092f50e973c653046241b78d6afcecdac5093a747a7c4ce24f5e509a6ce37
--> 7fd092f50e97
[1/2] STEP 5/10: RUN dnf install -y golang && dnf clean all
--> Using cache 44ca1995aab21363aa88b96ac6e4924ae48126d2bbcc72818520926b8a0b2433
--> 44ca1995aab2
[1/2] STEP 6/10: WORKDIR /workspace
--> Using cache 5b91f34d8e6ce6f53babce4f40afdf19546180bb9cc1b82a2d9f55d6908a786e
--> 5b91f34d8e6c
[1/2] STEP 7/10: COPY go.mod go.sum ./
--> Using cache 6ab9bc41fe53041c20bf836a7adf851b8415614afe28d58c72f397c628680597
--> 6ab9bc41fe53
[1/2] STEP 8/10: RUN go mod download
--> Using cache b2c875fa3b3bf75749bfc4ccb3091dd6784f1700872cfa3d422b5bbfc0d38c54
--> b2c875fa3b3b
[1/2] STEP 9/10: COPY . .
--> 1d085c167014

[codecov-commenter]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
158	2	156	0

View the top 2 failed test(s) by shortest run time

github.com/stackrox/stackrox-mcp/internal/testutil::

Stack Traces | 0s run time

Build error

github.com/stackrox/stackrox-mcp/internal/toolsets/mock::

Stack Traces | 0s run time

Build error

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