chore: add version on startup (#240)

Dockerfile

@@ -9,7 +9,7 @@ ADD . /src
 WORKDIR /src
 RUN cd /src && echo $(ls -1 /src)
 RUN go mod download
-RUN go build -ldflags "-X google.golang.org/protobuf/reflect/protoregistry.conflictPolicy=ignore" -o /bridge .
+RUN go build -ldflags "-X google.golang.org/protobuf/reflect/protoregistry.conflictPolicy=ignore -X github.com/ChainSafe/sygma-relayer/app.Version=$(sed -n '0,/## \[\([0-9.]*\)\]/s/.*\[\([0-9.]*\)\].*/\1/p' CHANGELOG.md)" -o /bridge .
 
 # final stage
 FROM debian:stable-slim

app/app.go

@@ -57,6 +57,8 @@ import (
 	"github.com/spf13/viper"
 )
 
+var Version string
+
 func Run() error {
 	var err error
 
@@ -276,7 +278,7 @@ func Run() error {
 		syscall.SIGQUIT)
 
 	relayerName := viper.GetString("name")
-	log.Info().Msgf("Started relayer: %s with PID: %s", relayerName, host.ID().Pretty())
+	log.Info().Msgf("Started relayer: %s with PID: %s. Version: v%s", relayerName, host.ID().Pretty(), Version)
 
 	_, err = keyshareStore.GetKeyshare()
 	if err != nil {