build: declare VERSION after the apt layers so the cache survivesv0.1.15

1 files changed, 3 insertions, 1 deletions

diff --git a/Dockerfile b/Dockerfile
index 41e2895..b55f44d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,13 +1,15 @@
 # syntax=docker/dockerfile:1
 
 FROM debian:bookworm-slim AS build
-ARG VERSION=0.1.0-dev
+# VERSION is declared after the expensive layers: the legacy builder
+# invalidates every layer that follows a changed build argument.
 RUN apt-get update \
  && apt-get install -y --no-install-recommends build-essential libncurses-dev \
       libssl-dev \
  && rm -rf /var/lib/apt/lists/*
 WORKDIR /src
 COPY . .
+ARG VERSION=0.1.0-dev
 # With .prebuilt/ the binaries are cross-compiled on the development machine
 # (see deploy/Dockerfile.cross); otherwise build and test from source.
 RUN if [ -x .prebuilt/bokfd ]; then \