use matrix strategy for cross-platform builds (#7)

* use matrix strategy for cross-platform builds

* add inform about using binary in dockerfile

* add arm64 windows build

* return test job

---------

Co-authored-by: Fedor Batonogov <f.batonogov@yandex.ru>

Author: github-actions[bot]

.github/workflows/go.yml

@@ -18,6 +18,24 @@ jobs:
       contents: write
       packages: write
 
+    strategy:
+      matrix:
+        include:
+          - os: linux
+            arch: amd64
+          - os: linux
+            arch: arm64
+          - os: darwin
+            arch: amd64
+          - os: darwin
+            arch: arm64
+          - os: windows
+            arch: amd64
+            suffix: .exe
+          - os: windows
+            arch: arm64
+            suffix: .exe
+
     steps:
       - uses: actions/checkout@v4
 
@@ -27,14 +45,21 @@ jobs:
           go-version: "1.23.3"
 
       - name: Build
-        run: go build -v ./...
+        run: |
+          GOOS=${{ matrix.os }} GOARCH=${{ matrix.arch }} go build -o gron-${{ matrix.os }}-${{ matrix.arch }}${{ matrix.suffix || '' }}
 
       - name: Test
         run: go test -v ./...
 
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: gron-${{ matrix.os }}-${{ matrix.arch }}${{ matrix.suffix || '' }}
+          path: gron-${{ matrix.os }}-${{ matrix.arch }}${{ matrix.suffix || '' }}
+
       - name: Release
-        uses: softprops/action-gh-release@v1
+        uses: softprops/action-gh-release@v2.1.0
         if: startsWith(github.ref, 'refs/tags/')
         with:
-          files: gron
-          generate_release_notes: true
+          files: gron-${{ matrix.os }}-${{ matrix.arch }}${{ matrix.suffix || '' }}
+          generate_release_notes: false

README.md

@@ -11,7 +11,7 @@ A simple and flexible task scheduler in a Docker container that supports both st
 
 ## Usage
 
-### Basic Example
+### Using Docker Image
 
 ```bash
 docker run --rm \
@@ -22,6 +22,33 @@ docker run --rm \
 ghcr.io/batonogov/gron:v0.1.1
 ```
 
+### Using Binary in Your Dockerfile
+
+You can download and use pre-built binaries in your own Docker images. Binaries are available for multiple platforms:
+
+- Linux (amd64, arm64)
+- macOS (Intel, Apple Silicon)
+- Windows (amd64, arm64)
+
+Example Dockerfile:
+
+```dockerfile
+FROM alpine:latest
+
+# Download gron binary for linux/amd64
+ADD https://github.com/batonogov/gron/releases/download/v0.1.1/gron-linux-amd64 /usr/local/bin/gron
+
+# Make it executable
+RUN chmod +x /usr/local/bin/gron
+
+# Your configuration
+COPY ./scripts /scripts
+ENV TASK_1="*/5 * * * * /scripts/backup.sh"
+
+# Run gron
+CMD ["/usr/local/bin/gron"]
+```
+
 ### Command Structure
 
 ```bash