Add Goreleaser-based release workflow and update license docs

Author: omertahaoztop

.github/workflows/release.yaml

@@ -0,0 +1,36 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+jobs:
+  build-and-release:
+    name: Build and Publish Release Artifacts
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Run Goreleaser
+        uses: goreleaser/goreleaser-action@v6
+        with:
+          distribution: goreleaser
+          version: latest
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+

.goreleaser.yaml

@@ -0,0 +1,36 @@
+project_name: uptime-kuma-gchat-proxy
+
+before:
+  hooks:
+    - go mod tidy
+
+builds:
+  - id: binaries
+    binary: uptime-kuma-gchat-proxy
+    env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+    goarch:
+      - amd64
+      - arm64
+    goarm:
+      - "7"
+    flags:
+      - -trimpath
+    ldflags:
+      - -s -w
+
+archives:
+  - id: default
+    builds:
+      - binaries
+    replacements:
+      amd64: x86_64
+
+checksum:
+  name_template: "{{ .ProjectName }}_checksums.txt"
+
+changelog:
+  use: git
+

README.md

@@ -2,7 +2,7 @@
 [![Forks][forks-shield]][forks-url]
 [![Stargazers][stars-shield]][stars-url]
 [![Issues][issues-shield]][issues-url]
-[![MIT License][license-shield]][license-url]
+[![GPLv3 License][license-shield]][license-url]
 
 <div align="center"> 
 
@@ -338,7 +338,11 @@ docker build -t uptime-kuma-gchat-proxy .
 
 ## License
 
-uptime-kuma-gchat-proxy is licensed under MIT. See [LICENSE](LICENSE) file for details.
+This project is released under the GNU General Public License v3.0.
+
+- You may run, study, share, and modify the software, provided derivative works remain GPL-compatible.
+- Source code for any distributed binaries must be made available to recipients.
+- The software is provided “as is”, without warranty; see [`LICENSE`](LICENSE) for the full text.
 
 [contributors-shield]: https://img.shields.io/github/contributors/monobilisim/uptime-kuma-gchat-proxy.svg?style=for-the-badge
 [contributors-url]: https://github.com/monobilisim/uptime-kuma-gchat-proxy/graphs/contributors