trying to get git commit hash to work

next.config.ts

@@ -2,6 +2,13 @@ import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
     output: "standalone",
+    generateBuildId: () => {
+        if (process.env.NODE_ENV === "development") return "development server";
+        if (!process.env.GIT_COMMIT) return "git commit hash is unavailable";
+        const hash = process.env.GIT_COMMIT;
+        if (!hash || hash.trim().length == 0) return "empty git commit hash";
+        return hash;
+    }
 };
 
 export default nextConfig;

src/Dockerfile

@@ -35,6 +35,9 @@ COPY . .
 
 ENV NEXT_TELEMETRY_DISABLED=1
 
+ARG GIT_COMMIT
+ENV GIT_COMMIT=$GIT_COMMIT
+
 RUN \
     if [ -f yarn.lock ]; then yarn run build; \
     elif [ -f package-lock.json ]; then npm run build; \