Link binaries statically when possible (#16)

### Description

Add -static to the linker flags to link the binaries statically.

### Type of change

* [ ] New feature
* [x] Feature improvement
* [x] Bug fix
* [ ] Documentation
* [ ] Cleanup / refactoring
* [ ] Other (please explain)


### How is this change tested ?

* [ ] Unit tests
* [x] Manual tests (explain)
* [ ] Tests are not needed

build-release-binaries.sh

@@ -4,12 +4,12 @@ mkdir -p bin
 
 export CGO_ENABLED=0
 export GOARM=7
-flag="-ldflags=-s -w -X main.Version=${GITHUB_REF_NAME:-dev}"
+flag="-ldflags=-extldflags=-static -s -w -X main.Version=${GITHUB_REF_NAME:-dev}"
 # tlsproxy
 for os in darwin linux; do
   for arch in amd64 arm64 arm; do
     echo "Building tlsproxy for ${os}-${arch}"
-    GOOS="${os}" GOARCH="${arch}" go build -trimpath "${flag}" -o "bin/tlsproxy-${os}-${arch}" .
+    GOOS="${os}" GOARCH="${arch}" go build -a -trimpath "${flag}" -o "bin/tlsproxy-${os}-${arch}" .
     if [[ $? == 0 ]]; then
       sha256sum "bin/tlsproxy-${os}-${arch}" | cut -d " " -f1 > "bin/tlsproxy-${os}-${arch}.sha256"
     fi
@@ -19,7 +19,7 @@ done
 for os in android darwin linux; do
   for arch in amd64 arm64 arm; do
     echo "Building tlsclient for ${os}-${arch}"
-    GOOS="${os}" GOARCH="${arch}" go build -trimpath "${flag}" -o "bin/tlsclient-${os}-${arch}" ./tlsclient
+    GOOS="${os}" GOARCH="${arch}" go build -a -trimpath "${flag}" -o "bin/tlsclient-${os}-${arch}" ./tlsclient
     if [[ $? == 0 ]]; then
       sha256sum "bin/tlsclient-${os}-${arch}" | cut -d " " -f1 > "bin/tlsclient-${os}-${arch}.sha256"
     fi

main.go

@@ -63,7 +63,7 @@ func main() {
 	if *configFile == "" {
 		log.Fatal("--config must be set")
 	}
-	log.Printf("INF tlsproxy %s %s", Version, runtime.Version())
+	log.Printf("INF tlsproxy %s %s %s/%s", Version, runtime.Version(), runtime.GOOS, runtime.GOARCH)
 	cfg, err := proxy.ReadConfig(*configFile)
 	if err != nil {
 		log.Fatalf("ERR %v", err)