fix(docker): include pnpm-workspace and npmrc in builder context

The committed lockfile records overrides from pnpm-workspace.yaml. With the
narrower manifest COPY, pnpm install --frozen-lockfile ran without the
workspace file and failed with ERR_PNPM_LOCKFILE_CONFIG_MISMATCH in CI.
Copy package.json, pnpm-lock, pnpm-workspace and .npmrc together so the
override config present in the lockfile is also supplied at install time.

src/lib/docker-build-contract.test.ts

@@ -6,7 +6,7 @@ const dockerfile = readFileSync("Dockerfile", "utf8");
 describe("Docker build cache", () => {
 	it("installs frozen dependencies before copying application source", () => {
 		const manifests = dockerfile.indexOf(
-			"COPY package.json pnpm-lock.yaml* ./",
+			"COPY package.json pnpm-lock.yaml* pnpm-workspace.yaml* .npmrc* ./",
 		);
 		const fetch = dockerfile.indexOf("pnpm fetch --ignore-scripts");
 		const install = dockerfile.indexOf("pnpm install --frozen-lockfile");