Publish pipeline: goreleaser + Maven Central + npm (#1)

* feat(cli): add Version var and version subcommand

* build(gradle): introduce uatu.version property for lockstep releases

* build(sdk-android): swap GitHub Packages for vanniktech Maven Central plugin

* build(spec-api): make package publish-ready for npm

* ci(release): add goreleaser config for cross-platform uatu CLI builds

* ci: add ci and release GitHub Actions workflows

* ci: restrict ci.yml to PR + workflow_dispatch (no direct push to master)

* docs(release): add local release targets, env example, and install docs

* build(sdk-android): make signAllPublications conditional on signing key

* ci(release): stage sidecar JAR at embed path before go build

* chore(spec-api): regenerate package-lock for updated package.json

* ci: install protoc-gen-go plugins before buf generate

* ci: bump Node to 22 (required for --experimental-strip-types)

.goreleaser.yaml

@@ -0,0 +1,64 @@
+version: 2
+
+project_name: uatu
+
+before:
+  hooks:
+    # The Go binary embeds the sidecar fat JAR via //go:embed gated by the
+    # `withsidecar` build tag. Rebuild the JAR and stage it at the embed
+    # path so the `go build` below picks up fresh bytes.
+    - make sidecar
+    - sh -c 'mkdir -p internal/sidecar/assets && cp sidecar/build/libs/sidecar-all.jar internal/sidecar/assets/sidecar-all.jar'
+
+builds:
+  - id: uatu
+    main: ./cmd/uatu
+    binary: uatu
+    env:
+      - CGO_ENABLED=0
+    flags:
+      - -tags=withsidecar
+    ldflags:
+      - -s -w -X main.Version={{.Version}}
+    goos:
+      - darwin
+      - linux
+    goarch:
+      - amd64
+      - arm64
+
+archives:
+  - id: uatu
+    ids:
+      - uatu
+    formats: [tar.gz]
+    name_template: "uatu_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
+    files:
+      - README.md
+      - LICENSE*
+
+checksum:
+  name_template: checksums.txt
+  algorithm: sha256
+
+snapshot:
+  version_template: "{{ incpatch .Version }}-snapshot-{{ .ShortCommit }}"
+
+changelog:
+  use: github
+  sort: asc
+  filters:
+    exclude:
+      - "^docs:"
+      - "^test:"
+      - "^chore:"
+      - "^ci:"
+      - Merge pull request
+      - Merge branch
+
+release:
+  github:
+    owner: priyanshujain
+    name: uatu
+  draft: false
+  prerelease: auto