fix server version bypass on linking

Author: x1unix

build/Dockerfile

@@ -13,7 +13,9 @@ COPY cmd ./cmd
 COPY pkg ./pkg
 COPY go.mod .
 COPY go.sum .
-RUN go build -o server -ldflags="-X 'main.Version=$APP_VERSION'" ./cmd/playground && \
+ARG APP_VERSION=1.0.0
+RUN echo "Building server with version $APP_VERSION" && \
+    go build -o server -ldflags="-X 'main.Version=$APP_VERSION'" ./cmd/playground && \
     GOOS=js GOARCH=wasm go build -o ./worker.wasm ./cmd/webworker && \
     cp $(go env GOROOT)/misc/wasm/wasm_exec.js .
 

cmd/playground/main.go

@@ -18,7 +18,7 @@ import (
 	"go.uber.org/zap"
 )
 
-const Version = "testing"
+var Version = "testing"
 
 type appArgs struct {
 	packagesFile    string