feat: add version

Dockerfile

@@ -10,8 +10,10 @@ RUN apk --no-cache add bash git openssh
 
 COPY . .
 
+ARG VERSION
+
 # inject versioning information & build the binary
-RUN export BUILD_TIME=$(date -u +"%Y-%m-%dT%H:%M:%SZ"); go build -ldflags "-X cicd-scratchpad.BuildTime=$BUILD_TIME" -o cicdscratchpad .
+RUN export BUILD_TIME=$(date -u +"%Y-%m-%dT%H:%M:%SZ"); go build -ldflags "-X 'main.BuildTime=$BUILD_TIME' -X 'main.Version=$VERSION'" -o cicdscratchpad .
 
 # runner
 FROM base AS runner

main.go

@@ -5,11 +5,14 @@ import (
 	"os"
 )
 
-var BuildTime = "Unknown"
+var (
+	Version   = "Unknown"
+	BuildTime = "Unknown"
+)
 
 func main() {
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte("Hello, world! Build time: " + BuildTime))
+		w.Write([]byte("Hello, world! This is version " + Version + " built at " + BuildTime))
 	})
 	http.ListenAndServe(os.Getenv("SCRATCHPAD_ADDRESS"), nil)
 }