chore(release): add complete GitHub Actions workflow for multi-platform release

.github/workflows/release.yml

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+name: Release RustMailer
+
+on:
+  push:
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]+'
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    name: Build ${{ matrix.target }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - target: x86_64-unknown-linux-gnu
+            os: ubuntu-latest
+          - target: x86_64-unknown-linux-musl
+            os: ubuntu-latest
+          - target: x86_64-apple-darwin
+            os: macos-latest
+          - target: x86_64-pc-windows-msvc
+            os: windows-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Rust
+        uses: actions/setup-rust@v1
+        with:
+          rust-version: stable
+          targets: ${{ matrix.target }}
+
+      - name: Setup Node.js & pnpm
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: "pnpm"
+
+      - name: Install pnpm
+        run: npm install -g pnpm
+
+      - name: Build frontend (web)
+        working-directory: ./web
+        run: |
+          pnpm install
+          pnpm run build
+
+      - name: Add MUSL target (if needed)
+        if: matrix.target == 'x86_64-unknown-linux-musl'
+        run: rustup target add x86_64-unknown-linux-musl
+
+      - name: Build Rust backend
+        run: cargo build --release --target=${{ matrix.target }}
+
+      - name: Prepare dist directory
+        run: mkdir -p dist
+
+      - name: Copy binary to dist
+        run: |
+          BIN=rustmailer
+          EXT=""
+          if [[ "${{ matrix.target }}" == *windows* ]]; then EXT=".exe"; fi
+          cp target/${{ matrix.target }}/release/${BIN}${EXT} dist/
+
+      - name: Pack artifact
+        run: |
+          cd dist
+          tar -czvf rustmailer-${{ github.ref_name }}-${{ matrix.target }}.tar.gz rustmailer*
+
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.target }}
+          path: dist/rustmailer-${{ github.ref_name }}-${{ matrix.target }}.tar.gz
+
+  release:
+    name: Create GitHub Release
+    needs: build
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Download build artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: ./artifacts
+
+      - name: Generate changelog with git-cliff
+        id: changelog
+        uses: orhun/git-cliff-action@v2
+        with:
+          args: --tag ${{ github.ref_name }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Publish GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ github.ref_name }}
+          name: ${{ github.ref_name }}
+          body: ${{ steps.changelog.outputs.content }}
+          draft: false
+          prerelease: false
+          files: ./artifacts/**/*.tar.gz

cliff.toml

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+# configuration file for git-cliff (0.1.0)
+
+[changelog]
+# changelog header
+header = """
+# RustMailer Changelog\n
+"""
+# template for the changelog body
+# https://tera.netlify.app/docs/#introduction
+body = """
+{% if version %}\
+    ## [{{ version | trim_start_matches(pat="v") }}] - {{ timestamp | date(format="%Y-%m-%d") }}
+{% else %}\
+    ## [unreleased]
+{% endif %}\
+{% for group, commits in commits | group_by(attribute="group") %}
+    ### {{ group | upper_first }}
+    {% for commit in commits %}
+        - {% if commit.breaking %}[**breaking**] {% endif %}{{ commit.message | upper_first }}\
+    {% endfor %}
+{% endfor %}\n
+"""
+# remove the leading and trailing whitespace from the template
+trim = true
+# changelog footer
+footer = """
+<!-- generated by git-cliff -->
+"""
+
+[git]
+# parse the commits based on https://www.conventionalcommits.org
+conventional_commits = false
+# filter out the commits that are not conventional
+filter_unconventional = false
+# regex for preprocessing the commit messages
+commit_preprocessors = [
+    { pattern = '\((\w+\s)?#([0-9]+)\)', replace = "([#${2}](https://github.com/rustmailer/rustmailer/issues/${2}))"},
+]
+# regex for parsing and grouping commits
+commit_parsers = [
+  { message = "^feat\\(frontend\\):", group = "Frontend Features" },
+  { message = "^fix\\(backend\\):", group = "Backend Fixes" },
+  { message = "^docs:", group = "Documentation" },
+  { message = "^ci:", group = "CI/CD" },
+  { message = ".*", group = "Others" },
+]
+# filter out the commits that are not matched by commit parsers
+filter_commits = false
+# glob pattern for matching git tags
+tag_pattern = "^[0-9]+(\\.[0-9]+){2}$"
+# regex for skipping tags
+#skip_tags = "v0.1.0-beta.1"
+# regex for ignoring tags
+ignore_tags = ""
+# sort the tags chronologically
+date_order = false
+# sort the commits inside sections by oldest/newest order
+sort_commits = "oldest"