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Dockerfile

@@ -4,7 +4,21 @@ FROM golang:1.24 AS builder
 WORKDIR /app
 COPY . .
 
-RUN CGO_ENABLED=0 GOOS=linux go build -o server
+# Which commit this image is. Reported by GET /live/api/v1/health, so "I pushed
+# it" and "it is running" stop being the same sentence — a redeploy can reuse a
+# cached image, and there was no way to tell from outside.
+#
+# Passed by the platform as a build argument:
+#   docker build --build-arg BUILD_VERSION=$(git rev-parse --short HEAD) .
+# In Dokploy this goes under the application's Build settings. Left unset it
+# reads "unknown", which is itself worth seeing — it means nothing stamped it.
+#
+# `.git` is not in the build context (see .dockerignore), so the build cannot
+# work this out for itself.
+ARG BUILD_VERSION=unknown
+
+RUN CGO_ENABLED=0 GOOS=linux go build \
+    -ldflags "-X nearle/controllers.Version=${BUILD_VERSION}" -o server
 
 # ---------- Runtime Stage ----------
 FROM alpine:latest