CI: Add workflows for building and publishing release binaries

.github/workflows/release_linux.yml

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+name: Build and publish release binaries for Linux
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: "1.21"
+
+    - uses: goto-bus-stop/setup-zig@v2
+      with:
+        version: "0.11.0"
+
+    - name: Test
+      run: go test -v ./...
+
+    - name: Build x86_64 Linux
+      run: GOOS=linux GOARCH=amd64 CGO_ENABLED=1 CC="zig cc -target x86_64-linux-musl" go build -o timew-sync-server-x86_64-linux
+
+    - name: Build aarch64 Linux
+      run: GOOS=linux GOARCH=arm64 CGO_ENABLED=1 CC="zig cc -target aarch64-linux-musl" go build -o timew-sync-server-aarch64-linux
+
+    - name: Release
+      uses: softprops/[email protected]
+      with:
+        files: |
+          timew-sync-server-x86_64-linux
+          timew-sync-server-aarch64-linux

.github/workflows/release_mac.yml

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+name: Build and publish release binaries for macOS
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+jobs:
+  build:
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: "1.21"
+
+    - name: Test
+      run: go test -v ./...
+
+    - name: Build x86_64 macOS
+      run: GOOS=darwin GOARCH=arm64 CGO_ENABLED=1 go build -o timew-sync-server-x86_64-macos
+
+    - name: Build aarch64 macOS
+      run: GOOS=darwin GOARCH=amd64 CGO_ENABLED=1 go build -o timew-sync-server-aarch64-macos
+
+    - name: Release
+      uses: softprops/[email protected]
+      with:
+        files: |
+          timew-sync-server-x86_64-macos
+          timew-sync-server-aarch64-macos