From 64a4993e9d6f61f0587d1decef03d4fcbbc9249d Mon Sep 17 00:00:00 2001
From: Shautvast <shautvast@gmail.com>
Date: Fri, 3 Apr 2026 21:59:56 +0200
Subject: [PATCH] reuse previous build artifacts

---
 backend/Dockerfile | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/backend/Dockerfile b/backend/Dockerfile
index 713d5b8..a77e5d3 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -2,10 +2,14 @@
 FROM rust:1.94-bookworm AS builder
 
 WORKDIR /usr/src/app
-COPY Cargo.toml Cargo.lock* ./
-COPY src/ src/
 
-RUN cargo build --release
+# Cache dependency build: only re-runs when Cargo.toml/lock change
+COPY Cargo.toml Cargo.lock* ./
+RUN mkdir src && echo 'fn main() {}' > src/main.rs && cargo build --release && rm -rf src
+
+# Now copy real source and build (dependencies already compiled)
+COPY src/ src/
+RUN touch src/main.rs && cargo build --release
 
 # Stage 2: Runtime
 FROM debian:bookworm-slim
@@ -18,4 +22,4 @@ COPY --from=builder /usr/src/app/target/release/maps-backend /usr/local/bin/maps
 
 EXPOSE 8080
 
-CMD ["maps-backend"]
+CMD ["maps-backend"]
\ No newline at end of file