add ci

.github/workflows/go.yml

@@ -0,0 +1,42 @@
+name: Go
+
+on:
+  push:
+    branches: [ main ]
+    tags: ["v*.*.*"]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.17
+
+    - name: Build
+      run: |
+        build() {
+          export GOOS=$1
+          export GOARCH=$2
+          go build -ldflags "-s -w" -o build/cert-copier-${1}-${2}${3} main.go
+        }
+        build linux amd64
+        build windows amd64 .exe
+        build windows 386 .exe
+        build darwin amd64
+        build darwin arm64
+    - name: Upload a Build Artifact
+      uses: actions/[email protected]
+      with:
+        path: build/*
+    - name: Release
+      uses: softprops/action-gh-release@v1
+      if: startsWith(github.ref, 'refs/tags/')
+      with:
+        files: build/*

main.go

@@ -11,6 +11,7 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
+	"path/filepath"
 	"regexp"
 )
 
@@ -108,7 +109,8 @@ var fileNameRegex = regexp.MustCompile(`[^a-zA-Z0-9_\-.]`)
 
 func main() {
 	if len(os.Args) != 2 {
-		log.Fatal("usage: go run main.go $addr, for example: go run main.go github.com:443")
+		name := filepath.Base(os.Args[0])
+		log.Fatalf("usage: %s $addr, for example: %s github.com:443", name, name)
 	}
 	certs, err := getCertsFromNetwork(os.Args[1])
 	if err != nil {