Relocate packaging: RPM, shell completions, no-TTY fix, repaired tests (#13)

## Why

The unit tests stopped compiling after the `--pm` → `-p`/`-i` match-modifier refactor was left uncommitted, there was no RPM/completions distribution story, and invoking the tool without a TTY against an empty pipe silently returned nothing. This makes the project releasable and safe to run from agents/CI.

## Changes

- Make stdin handling robust: replace the fragile `!isTerminal` check with `stdinReader()`, which only reads node names when stdin is a real pipe/redirect carrying data. Terminals, `/dev/null`, and empty/closed pipes now fall through to a normal query, so running without a TTY behaves like an interactive run.
- Repair and expand `main_test.go` to match the current `buildQuery`/`run` signatures; add coverage for the match modifiers, all output modes, config precedence, and the new `stdinReader` logic. `httptest` stubs PuppetDB (no live deps).
- Add nfpm packaging (`packaging/nfpm.yaml`, `scripts/build-rpm.sh`): installs the binary to `/usr/bin/node-lookup` and bundles generated bash/zsh/fish completions under the standard system paths.
- Rework the Makefile to build into `dist/` and add `completions`/`rpm` targets.
- Split PR CI into `build`, `test`, and `pre-commit` workflows and extend `release` to build the RPM and `PUT` it to the artifactapi `rpm-internal` repo. Every step sets a `serviceAccount` and k8s resources.

The project directory has also been relocated under `prodenv`.

Reviewed-on: #13
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>

scripts/build-rpm.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+#
+# Package the (already built) node-lookup binary into an RPM with nfpm,
+# bundling generated bash/zsh/fish shell completions.
+# Usage: scripts/build-rpm.sh [version]   (version defaults to $CI_COMMIT_TAG)
+#
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "${ROOT_DIR}"
+
+VERSION="${1:-${CI_COMMIT_TAG:-0.0.0-dev}}"
+VERSION="${VERSION#v}" # strip a leading v
+BINARY="node-lookup"
+DIST="dist"
+
+if [ ! -f "${DIST}/${BINARY}" ]; then
+  echo "ERROR: ${DIST}/${BINARY} not found; run 'make build' first" >&2
+  exit 1
+fi
+
+# Generate shell completions from the freshly built binary so they always match
+# the shipped flags/subcommands.
+COMP_DIR="${DIST}/completions"
+mkdir -p "${COMP_DIR}"
+"./${DIST}/${BINARY}" completion bash >"${COMP_DIR}/${BINARY}.bash"
+"./${DIST}/${BINARY}" completion zsh >"${COMP_DIR}/_${BINARY}"
+"./${DIST}/${BINARY}" completion fish >"${COMP_DIR}/${BINARY}.fish"
+
+export PACKAGE_NAME="${BINARY}"
+export PACKAGE_VERSION="${VERSION}"
+export PACKAGE_RELEASE="1"
+export PACKAGE_ARCH="amd64"
+export PACKAGE_PLATFORM="linux"
+export PACKAGE_DESCRIPTION="CLI tool that queries the PuppetDB API to look up and filter node facts"
+export PACKAGE_MAINTAINER="Ben Vincent <ben@unkin.net>"
+export PACKAGE_HOMEPAGE="https://git.unkin.net/unkin/node-lookup"
+export PACKAGE_LICENSE="MIT"
+
+envsubst <packaging/nfpm.yaml >"${DIST}/nfpm.yaml"
+nfpm pkg --config "${DIST}/nfpm.yaml" --target "${DIST}" --packager rpm
+
+echo "Built:"
+ls -1 "${DIST}"/*.rpm