Bake in git commit into dendritejs binary (#1048)

build-dendritejs.sh

@@ -0,0 +1,4 @@
+#!/bin/bash -eu
+
+export GIT_COMMIT=$(git rev-list -1 HEAD) && \
+GOOS=js GOARCH=wasm go build -ldflags "-X main.GitCommit=$GIT_COMMIT" -o main.wasm ./cmd/dendritejs

cmd/dendritejs/main.go

@@ -46,8 +46,10 @@ import (
 	_ "github.com/matrix-org/go-sqlite3-js"
 )
 
+var GitCommit string
+
 func init() {
-	fmt.Println("dendrite.js starting...")
+	fmt.Printf("[%s] dendrite.js starting...\n", GitCommit)
 }
 
 const keyNameEd25519 = "_go_ed25519_key"